问答题Facebook is, in Silicon Vallese, a “social network”: a website for keeping track of your friends and sending them messages and sharing photos and doing all those other things that a good little Web 2.0 company is supposed to help you do. It was started

It would be all too easy to say that Facebook’s market meltdown is coming to an end.After all,Mark Zuckerberg’s social
network burned as much as$50 billion of shareholders’wealth in just a couple months.To put that in context,since its debut(初次登台)on NASDAQ in May,Facebook has lost value nearly equal to Yahoo,AOL,Zynga,Yelp,Pandora,Open Table,
Group on,LinkedIn,and Angie's List combined,plus that of the bulk of the publicly traded newspaper industry:
As shocking as this utter failure may be to the nearly 1 billion faithful Facebook users around the world,it’s no surprise to
anyone who read the initial public offering(IPO)prospectus(首次公开募股说明书).Worse still,all the crises that emerged
when the company debuted-overpriced shares,poor corporate governance,huge challenges to the core business,and a
damaged brand-remain today.Facebook looks like a prime example of what Wall Street calls a falling knife-that is,one that
can cost investors their fingers if they try to catch it.
Start with the valuation.To justify a stock price close to the lower end of the projected range in the IPO,say$28 a share,Facebook’s future growth would have needed to match that of Google seven years earlier.That would have required
increasing revenue by some 80 percent annually and maintaining high profit margins all the while.
That’s not happening.In the first half of 2012,Facebook reported revenue of$2.24 billion,up 38 percent from the same
period in 2011.At the same time,the company’s costs surged to$2.6 billion in the six-month period.
This so-so performance reflects the Achilles’heel of Facebook’s business model,which the company clearly stated in a
list of risk factors associated with its IPO:it hasn’t yet figured out how to advertise effectively on mobile devices,The number
of Facebook users accessing the site on their phones surged by 67 percent to 543 million in the last quarter,or more than
half its customer base.
Numbers are only part of the problem.The mounting pile of failure creates a negative feedback loop that threatens Facebook’s future in other ways.Indeed,the more Facebook’s disappointment in the market is catalogued,the worse Facebook’s
image becomes.Not only does that threaten to rub off on users,it’s bad for recruitment and retention of talented hackers,who are the lifeblood of Zuckerberg’s creation.
Yet the brilliant CEO can ignore the sadness and complaints of his shareholders thanks to the super-voting stock he
holds.This arrangement also was fully disclosed at the time of the offering.It’s a pity so few investors apparently bothered to
do their homework.


What can be inferred about Facebook from the first paragraph 《》（）

A.Its market meltdown has been easily halted.
B.It has increased trade with the newspaper industry.
C.It has encountered utter failure since its stock debut.
D.Its shareholders have invested$50 billion in a social network.

Priests,teachers and parents have for generations advised their wards io think twice before speaking,to count to ten when angry and to get a good night's sleep before making big decisions.Social networks care little for seconcl thoughts.Services such as Facebook and Twitter are built to maximise"virality",making it irresistible to share,like and retweet things.They are getting better at it:fully half of the 40 most-retweeted tweets clate from January last year.Starting this month,however,users of WhatsApp,a messaging service owned by Facebook,will find it harder to spread content.They will no longer be able to forward messages to more than 20 0thers in one go,down from more than 100.The goal is not to prevent people from sharing information-only to get users to think about what they are passing on.It Js an idea other platforms should consider copying.Skeptics point out that WhatsApp can afford to hinder the spread of information on its platform because it does not rely on the sale of adverrisements to make money.Slowing down sharing would be more damaging to social networks such as Facebook and Twitter,which make money by keeping users on their sites and showing them ads.Their shareholders would surely refuse anything that lessens engagement.Sure enough,Facebook's shares fell by 23%in after-hours trading,partly because Mark Zuckerberg,its boss,said that its priority would be to get users to interact more with each other,not to promote viral content.Yet the short-term pain caused by a decline in virality may be in the long-term interests of the social networks.Fake news and concerns about cligital addiction,among other things,have already damaged the reputations of tech platforms.Moves to slow sharing could lielp see off harsh action by regulators and lawmakers.They could also improve its service.Instagram,a photo-sharing social network also owned by Facebook,shows that you can be successful without resorting to virality.It offers no sharing options and does not allow links but boasts more than a billion monthly users.It has remained relatively free of misinformation.Facebook does not break out Instagram's revenues,but it is thought to make money.The need to constrain virality is becoming ever more urgent.About half the world uses the internet today.The next 3.8bn users to go online will be poorer and less familiar with media.The examples of deceptions,misinformation and violence in India suggest that the capacity to manipulate people online is even greater when they first gain access to cligital communications.Small changes can have big effects:social networks have become expert at making their services compulsive by adjusting shades of blue and the size of buttons.They have the knowledge and the tools to maximise the sharing of information.That gives them the power to limit its virality,too.
The advice of priests,teachers and parents is brought up to

A.stress the necessity for social networks to circulate them.
B.highlight the sharing without thinking on social networks.
C.warn people against the danger of indulging in virtual life.
D.urge social networks to build services more cautiously.

Text 2 Should we be thinking of Facebook as a news site?Is that how Facebook thinks of itself?No,not primarily,Facebook now says.In a document posted on Wednesday,the company explained,for the first time,the"values"that govem its news feed,the scrolling list of posts that Facebook presents to its l.65 billion users every time they log on.Though it is couched in the anodyne language of a corporate news release,the document's message should come as a shock to everyone in the media business.According to these values,Facebook has a single overriding purpose,and it isn't news.Facebook is mainly for telling you what's up with your friends and family.Adam Mosseri,the Facebook manager in charge of the news feed,said in a recent interview that informing and entertaining users was also part of the company's mission.But he made clear that news and entertainment were secondary pursuits."We think more,spend more time and work on more projects that try to help people express themselves with their friends or learn about their friends or have conversations with their friends,"he said.As if to underscore the point,the company is making a tweak to its news feed ranking system to increase the prominence ofcoiitent from your friends and family over posts by news companies and other organizations.It is also waming news companies that their traffic might decline as a result of the change.These moves highlight a truth that tends to get lost in commentary about the social network's influence over the news:At Facebook,infonrung users about the world will always take a back seat to cute pictures of babies..Because Facebook does not think ofitself primarily as a news company,it seems to want us to stop expecting it to act like one.Whether we should,though,is a more complicated matter.The company has long been hounded by journalists and activists over its power to shape the news through its algorithms,or the code that determines which stories you see,in the news feed.The question of how to think about Facebook's role in the news-and whether we should demand the same standards of accuracy,objectivity,transparency and fairness that we expect from traditional outlets-may be the primary puzzle ofour new media age.According to Facebook,the values outlined in the document have been the informal governing philosophy of its news feed since it was started a decade ago,and Mr.Zuckerberg and Chris Cox,Facebook's chiefproduct officer,were deeply involved in drafiing the new document.29.Mr.Zuckerberg and Chris Cox believe that.

A.serious news is the most valuable to be posted to their users.
B.the standards ofnews they post are accurate and objective.
C.they have the conventional governing policy ofits news.
D.the intefaction with friends is the most important news.

Priests,teachers and parents have for generations advised their wards io think twice before speaking,to count to ten when angry and to get a good night's sleep before making big decisions.Social networks care little for seconcl thoughts.Services such as Facebook and Twitter are built to maximise"virality",making it irresistible to share,like and retweet things.They are getting better at it:fully half of the 40 most-retweeted tweets clate from January last year.Starting this month,however,users of WhatsApp,a messaging service owned by Facebook,will find it harder to spread content.They will no longer be able to forward messages to more than 20 0thers in one go,down from more than 100.The goal is not to prevent people from sharing information-only to get users to think about what they are passing on.It Js an idea other platforms should consider copying.Skeptics point out that WhatsApp can afford to hinder the spread of information on its platform because it does not rely on the sale of adverrisements to make money.Slowing down sharing would be more damaging to social networks such as Facebook and Twitter,which make money by keeping users on their sites and showing them ads.Their shareholders would surely refuse anything that lessens engagement.Sure enough,Facebook's shares fell by 23%in after-hours trading,partly because Mark Zuckerberg,its boss,said that its priority would be to get users to interact more with each other,not to promote viral content.Yet the short-term pain caused by a decline in virality may be in the long-term interests of the social networks.Fake news and concerns about cligital addiction,among other things,have already damaged the reputations of tech platforms.Moves to slow sharing could lielp see off harsh action by regulators and lawmakers.They could also improve its service.Instagram,a photo-sharing social network also owned by Facebook,shows that you can be successful without resorting to virality.It offers no sharing options and does not allow links but boasts more than a billion monthly users.It has remained relatively free of misinformation.Facebook does not break out Instagram's revenues,but it is thought to make money.The need to constrain virality is becoming ever more urgent.About half the world uses the internet today.The next 3.8bn users to go online will be poorer and less familiar with media.The examples of deceptions,misinformation and violence in India suggest that the capacity to manipulate people online is even greater when they first gain access to cligital communications.Small changes can have big effects:social networks have become expert at making their services compulsive by adjusting shades of blue and the size of buttons.They have the knowledge and the tools to maximise the sharing of information.That gives them the power to limit its virality,too.
The author suggests social networks should

A.limit the sharing of information.
B.publicize the knowledge about virality.
C.avoid making further small changes.
D.get more control over new netizens.

Priests,teachers and parents have for generations advised their wards io think twice before speaking,to count to ten when angry and to get a good night's sleep before making big decisions.Social networks care little for seconcl thoughts.Services such as Facebook and Twitter are built to maximise"virality",making it irresistible to share,like and retweet things.They are getting better at it:fully half of the 40 most-retweeted tweets clate from January last year.Starting this month,however,users of WhatsApp,a messaging service owned by Facebook,will find it harder to spread content.They will no longer be able to forward messages to more than 20 0thers in one go,down from more than 100.The goal is not to prevent people from sharing information-only to get users to think about what they are passing on.It Js an idea other platforms should consider copying.Skeptics point out that WhatsApp can afford to hinder the spread of information on its platform because it does not rely on the sale of adverrisements to make money.Slowing down sharing would be more damaging to social networks such as Facebook and Twitter,which make money by keeping users on their sites and showing them ads.Their shareholders would surely refuse anything that lessens engagement.Sure enough,Facebook's shares fell by 23%in after-hours trading,partly because Mark Zuckerberg,its boss,said that its priority would be to get users to interact more with each other,not to promote viral content.Yet the short-term pain caused by a decline in virality may be in the long-term interests of the social networks.Fake news and concerns about cligital addiction,among other things,have already damaged the reputations of tech platforms.Moves to slow sharing could lielp see off harsh action by regulators and lawmakers.They could also improve its service.Instagram,a photo-sharing social network also owned by Facebook,shows that you can be successful without resorting to virality.It offers no sharing options and does not allow links but boasts more than a billion monthly users.It has remained relatively free of misinformation.Facebook does not break out Instagram's revenues,but it is thought to make money.The need to constrain virality is becoming ever more urgent.About half the world uses the internet today.The next 3.8bn users to go online will be poorer and less familiar with media.The examples of deceptions,misinformation and violence in India suggest that the capacity to manipulate people online is even greater when they first gain access to cligital communications.Small changes can have big effects:social networks have become expert at making their services compulsive by adjusting shades of blue and the size of buttons.They have the knowledge and the tools to maximise the sharing of information.That gives them the power to limit its virality,too.
It can be inferred from Paragraphs 4 and 5 that controlling virality could

A.eliminate concerns about digital addiction.
B.keep a social network free of misinformation
C.contribute to the success of a social network.
D.exempt a social network from harsh regulation

汉译英：“花茶；碳化硅”，正确的翻译为（　　）。
A.scented tea：silicon carbide
B.silicon carbide：scented tea
C.scented tea：salted cucumber
D.salted cucumber；silicon carbide

资料：The movement of consumers from public social media to private messaging has been so rapid that Business Insider reported that the combined usage of the top four messaging apps now exceeds the combined usage of the top four social media apps。Falling data prices，cheaper devices，and improved features are helping propel this growth。
Why the hunger for private messaging apps？ Perhaps people are becoming more interested in actually communicating rather than broadcasting。Maybe we don’t want personal and private lives merging any more and we want control over our different social circles within these messaging apps。As my 16-year-old nephew put it，“My friend posted on Facebook and we made fun of him。We only use Snapchat now because who wants to put everything in public all the time？ This just connects me with my real friends。”
Social media won’t go away，but traditional social networks may become less important to certain groups。The rise of more intimate channels presents new opportunities，and perhaps perils，for marketers。

What is NOT the reason for the growth of private messaging apps？

A.People are tired of social media.
B.App’s improved features.
C.People are demanding for real communication.
D.Cheaper data and devices.

资料：The movement of consumers from public social media to private messaging has been so rapid that Business Insider reported that the combined usage of the top four messaging apps now exceeds the combined usage of the top four social media apps。Falling data prices，cheaper devices，and improved features are helping propel this growth。
Why the hunger for private messaging apps？ Perhaps people are becoming more interested in actually communicating rather than broadcasting。Maybe we don’t want personal and private lives merging any more and we want control over our different social circles within these messaging apps。As my 16-year-old nephew put it，“My friend posted on Facebook and we made fun of him。We only use Snapchat now because who wants to put everything in public all the time？ This just connects me with my real friends。”
Social media won’t go away，but traditional social networks may become less important to certain groups。The rise of more intimate channels presents new opportunities，and perhaps perils，for marketers。

What can be inferred from the third paragraph？

A.The traditional social networks will have great impact on certain groups.
B.The private messaging apps will replace the social media apps.
C.The intimate channels can be the double-edged swords to the sellers.
D.The growth of the intimate channels will bring only benefits to the marketers.

共用题干
1.Tired of social networking?Logging off Facebook?You're probably not the only one.Fearing for their privacy or perhaps just bored with using the site,100,000 Britons are said to have deactivated（注销）their accounts last month. And Facebook fatigue seems to be catching. Six million logged off for good in the U.S.too,figures show.Worldwide,the rate of growth has slowed for a second month in a row一and as it aims to reach its goal of one billion active users,Facebook is having to rely on developing countries to boost its numbers.The figures suggest that there could be a"natural limit" for Facebook's saturation（饱和）.There is even speculation on blogs that, as is feared for its failing rival MySpace,the website could one day "pass into oblivion"（被人遗忘）.
2.Earlier this year,executives announced that the number of Facebook accounts held in the UK had reached 30 million,accounting for about half the population.The milestone was an increase of four million from last July and represented the highest saturation of any country in Europe.
3.But times change一and last month more than 100,000 in the UK stopped using the website, figures show.In the U.S.,user numbers dropped from 155.2 million to 149.4 million throughout May.In Canada there was also a fall,of about 1.5 million users,while in Russia and Norway num-bers also fell by more than 100,000 users.
4.It's not all bad news for the site.Worldwide,Facebook is still expanding and has around 600 million users,thanks to strong growth in countries such as Mexico and Brazil.
5.According to Eric Eldon,of the website Inside Facebook,which obtained the figures through analysis of the company's advertising tools,there is a point at which the site can no longer grow, once it has established itself in a country."By the time Facebook reaches around 50 percent of the total population in a given country,growth generally slows to a halt,"he explained.

Paragraph 1_________
A:Facebook users in Britain increased a lot earlier this year.
B:Facebook seems to be faced with a gloomy future.
C:Facebook is a very popular social place for many people.
D:Users of Facebook dropped dramatically in many countries.
E:In spite of the setback in some countries,Facebook is still expanding worldwide.
F: There is a reason for the decreasing users of Facebook.

Text 2 Should we be thinking of Facebook as a news site?Is that how Facebook thinks of itself?No,not primarily,Facebook now says.In a document posted on Wednesday,the company explained,for the first time,the"values"that govem its news feed,the scrolling list of posts that Facebook presents to its l.65 billion users every time they log on.Though it is couched in the anodyne language of a corporate news release,the document's message should come as a shock to everyone in the media business.According to these values,Facebook has a single overriding purpose,and it isn't news.Facebook is mainly for telling you what's up with your friends and family.Adam Mosseri,the Facebook manager in charge of the news feed,said in a recent interview that informing and entertaining users was also part of the company's mission.But he made clear that news and entertainment were secondary pursuits."We think more,spend more time and work on more projects that try to help people express themselves with their friends or learn about their friends or have conversations with their friends,"he said.As if to underscore the point,the company is making a tweak to its news feed ranking system to increase the prominence ofcoiitent from your friends and family over posts by news companies and other organizations.It is also waming news companies that their traffic might decline as a result of the change.These moves highlight a truth that tends to get lost in commentary about the social network's influence over the news:At Facebook,infonrung users about the world will always take a back seat to cute pictures of babies..Because Facebook does not think ofitself primarily as a news company,it seems to want us to stop expecting it to act like one.Whether we should,though,is a more complicated matter.The company has long been hounded by journalists and activists over its power to shape the news through its algorithms,or the code that determines which stories you see,in the news feed.The question of how to think about Facebook's role in the news-and whether we should demand the same standards of accuracy,objectivity,transparency and fairness that we expect from traditional outlets-may be the primary puzzle ofour new media age.According to Facebook,the values outlined in the document have been the informal governing philosophy of its news feed since it was started a decade ago,and Mr.Zuckerberg and Chris Cox,Facebook's chiefproduct officer,were deeply involved in drafiing the new document.30.The best title for this text could be.

A.Facebook-a News Giant That Would Rather Show Us Baby Pictures
B.Facebook Is Reluctant to Be a News Website
C.Facebook,a New Bom Baby in the Age oflntemet
D.Facebook's Mr.Zuckerberg and Chris Cox

Priests,teachers and parents have for generations advised their wards io think twice before speaking,to count to ten when angry and to get a good night's sleep before making big decisions.Social networks care little for seconcl thoughts.Services such as Facebook and Twitter are built to maximise"virality",making it irresistible to share,like and retweet things.They are getting better at it:fully half of the 40 most-retweeted tweets clate from January last year.Starting this month,however,users of WhatsApp,a messaging service owned by Facebook,will find it harder to spread content.They will no longer be able to forward messages to more than 20 0thers in one go,down from more than 100.The goal is not to prevent people from sharing information-only to get users to think about what they are passing on.It Js an idea other platforms should consider copying.Skeptics point out that WhatsApp can afford to hinder the spread of information on its platform because it does not rely on the sale of adverrisements to make money.Slowing down sharing would be more damaging to social networks such as Facebook and Twitter,which make money by keeping users on their sites and showing them ads.Their shareholders would surely refuse anything that lessens engagement.Sure enough,Facebook's shares fell by 23%in after-hours trading,partly because Mark Zuckerberg,its boss,said that its priority would be to get users to interact more with each other,not to promote viral content.Yet the short-term pain caused by a decline in virality may be in the long-term interests of the social networks.Fake news and concerns about cligital addiction,among other things,have already damaged the reputations of tech platforms.Moves to slow sharing could lielp see off harsh action by regulators and lawmakers.They could also improve its service.Instagram,a photo-sharing social network also owned by Facebook,shows that you can be successful without resorting to virality.It offers no sharing options and does not allow links but boasts more than a billion monthly users.It has remained relatively free of misinformation.Facebook does not break out Instagram's revenues,but it is thought to make money.The need to constrain virality is becoming ever more urgent.About half the world uses the internet today.The next 3.8bn users to go online will be poorer and less familiar with media.The examples of deceptions,misinformation and violence in India suggest that the capacity to manipulate people online is even greater when they first gain access to cligital communications.Small changes can have big effects:social networks have become expert at making their services compulsive by adjusting shades of blue and the size of buttons.They have the knowledge and the tools to maximise the sharing of information.That gives them the power to limit its virality,too.
WhatsApp's new move is intended to

A.prevent users from spreading content.
B.get users to interact more with each other.
C.put a limit on users'overuse of social networks.
D.get users to think twice before sharing content.

Priests,teachers and parents have for generations advised their wards io think twice before speaking,to count to ten when angry and to get a good night's sleep before making big decisions.Social networks care little for seconcl thoughts.Services such as Facebook and Twitter are built to maximise"virality",making it irresistible to share,like and retweet things.They are getting better at it:fully half of the 40 most-retweeted tweets clate from January last year.Starting this month,however,users of WhatsApp,a messaging service owned by Facebook,will find it harder to spread content.They will no longer be able to forward messages to more than 20 0thers in one go,down from more than 100.The goal is not to prevent people from sharing information-only to get users to think about what they are passing on.It Js an idea other platforms should consider copying.Skeptics point out that WhatsApp can afford to hinder the spread of information on its platform because it does not rely on the sale of adverrisements to make money.Slowing down sharing would be more damaging to social networks such as Facebook and Twitter,which make money by keeping users on their sites and showing them ads.Their shareholders would surely refuse anything that lessens engagement.Sure enough,Facebook's shares fell by 23%in after-hours trading,partly because Mark Zuckerberg,its boss,said that its priority would be to get users to interact more with each other,not to promote viral content.Yet the short-term pain caused by a decline in virality may be in the long-term interests of the social networks.Fake news and concerns about cligital addiction,among other things,have already damaged the reputations of tech platforms.Moves to slow sharing could lielp see off harsh action by regulators and lawmakers.They could also improve its service.Instagram,a photo-sharing social network also owned by Facebook,shows that you can be successful without resorting to virality.It offers no sharing options and does not allow links but boasts more than a billion monthly users.It has remained relatively free of misinformation.Facebook does not break out Instagram's revenues,but it is thought to make money.The need to constrain virality is becoming ever more urgent.About half the world uses the internet today.The next 3.8bn users to go online will be poorer and less familiar with media.The examples of deceptions,misinformation and violence in India suggest that the capacity to manipulate people online is even greater when they first gain access to cligital communications.Small changes can have big effects:social networks have become expert at making their services compulsive by adjusting shades of blue and the size of buttons.They have the knowledge and the tools to maximise the sharing of information.That gives them the power to limit its virality,too.
Skeptics hold that slowing down sharing would

A.fail to curb virality
B.be bad for users.
C.do no good to advertisers.
D.go against shareholders.

Text 2 Should we be thinking of Facebook as a news site?Is that how Facebook thinks of itself?No,not primarily,Facebook now says.In a document posted on Wednesday,the company explained,for the first time,the"values"that govem its news feed,the scrolling list of posts that Facebook presents to its l.65 billion users every time they log on.Though it is couched in the anodyne language of a corporate news release,the document's message should come as a shock to everyone in the media business.According to these values,Facebook has a single overriding purpose,and it isn't news.Facebook is mainly for telling you what's up with your friends and family.Adam Mosseri,the Facebook manager in charge of the news feed,said in a recent interview that informing and entertaining users was also part of the company's mission.But he made clear that news and entertainment were secondary pursuits."We think more,spend more time and work on more projects that try to help people express themselves with their friends or learn about their friends or have conversations with their friends,"he said.As if to underscore the point,the company is making a tweak to its news feed ranking system to increase the prominence ofcoiitent from your friends and family over posts by news companies and other organizations.It is also waming news companies that their traffic might decline as a result of the change.These moves highlight a truth that tends to get lost in commentary about the social network's influence over the news:At Facebook,infonrung users about the world will always take a back seat to cute pictures of babies..Because Facebook does not think ofitself primarily as a news company,it seems to want us to stop expecting it to act like one.Whether we should,though,is a more complicated matter.The company has long been hounded by journalists and activists over its power to shape the news through its algorithms,or the code that determines which stories you see,in the news feed.The question of how to think about Facebook's role in the news-and whether we should demand the same standards of accuracy,objectivity,transparency and fairness that we expect from traditional outlets-may be the primary puzzle ofour new media age.According to Facebook,the values outlined in the document have been the informal governing philosophy of its news feed since it was started a decade ago,and Mr.Zuckerberg and Chris Cox,Facebook's chiefproduct officer,were deeply involved in drafiing the new document.27.By"making a tweak",Facebook means to.

A.adjust the ranking system of the different news.
B.give priority to news about friends and family.
C.solve the traffic problem online.
D.wam media companies to change their organizations.

共用题干
Better Solar Energy Systems: More Heat, More Light
Solar photovoltaic thermal energy systems,or PVTs,generate both heat and electricity,but until now they haven't been very good at the heat-generating part compared to a stand-alone solar thermal collector. That's because they operate at low temperatures to cool crystalline silicon solar cells,which lets the silicon generate more electricity but isn't a very efficient way to gather heat.
That's a problem of economics. Good solar hot-water systems can harvest much more energy than a solar-electric system at a substantially lower cost. And it's also a space problem:photovol-taic cells can take up all the space on the roof,leaving little room for thermal applications.
In a pair of studies,Joshua Pearce,an associate professor of materials science and engineer-ing,has devised a solution in the form of a better PVT made with a different kind of silicon.His research collaborators are Kunal Girotra from Thin Silicon in California and Michael Pathak and Stephen Harrison from Queen's University,Canada.
Most solar panels are made with crystalline silicon,but you can also make solar cells out of amorphous silicon,commonly known as thin-film silicon.They don't create as much electricity, but they are lighter,flexible,and cheaper. And,because they require much less silicon,they have a greener footprint. Unfortunately,thin-film silicon solar cells are vulnerable to some bad-news physics in the form of the Staebler-Wronski effect.
"That means that their efficiency drops when you expose them to light-pretty much the worst possible effect for a solar cell,"Pearce explains,which is one of the reasons thin-film solar panels make up only a small fraction of the market.
However,Pearce and his team found a way to engineer around the Staebler-Wronski effect by incorporating thin-film silicon in a new type of PVT. You don't have to cool down thin-film silicon to make it work.In fact,Pearce's group discovered that by heating it to solar-thermal operating temperatures,near the boiling point of water,they could make thicker cells that largely overcame the Staebler-Wronski effect. When they applied the thin-fulm silicon directly to a solar thermal en-ergy collector,they also found that by baking the cell once a day,they boosted the solar cell's e-lectrical efficiency by over 10 percent.

Which of the following statrnents is true?
A: Thin-film silicon's electrical efficiency improves when heated up.
B: New techniques have been developed to produce thin-film silicon.
C: Thin-film silicon works efficiently at low temperature.
D: A new material enlarging the Staebler-WronsKi effect has been created.

Compared with other areas of our social lives,we tend to boast far more on social media.For instance,few of us will stand on a neighborhood corner and declare how accomplished we are or how much we love our spouse.On Facebook,however,we have no uneasiness about routinely posting photographs of intimate family gatherings,foreign vacations,and fancy meals.What's more,many of us share boasts with hundreds or even thousands of social media connections,with little knowledge or concern about who's seeing them or what effect it has on them.Despite the risk of negative effects,we can't help boasting on social media because,as psychologists have argued,boasting satisfies fundamental human motives of creating a favorable first impression with strangers,and building a positive image among those who know us.In our vast social media spheres,boasting is also a good way,or even possibly the only way,to attract attention.

资料：The movement of consumers from public social media to private messaging has been so rapid that Business Insider reported that the combined usage of the top four messaging apps now exceeds the combined usage of the top four social media apps。Falling data prices，cheaper devices，and improved features are helping propel this growth。
Why the hunger for private messaging apps？ Perhaps people are becoming more interested in actually communicating rather than broadcasting。Maybe we don’t want personal and private lives merging any more and we want control over our different social circles within these messaging apps。As my 16-year-old nephew put it，“My friend posted on Facebook and we made fun of him。We only use Snapchat now because who wants to put everything in public all the time？ This just connects me with my real friends。”
Social media won’t go away，but traditional social networks may become less important to certain groups。The rise of more intimate channels presents new opportunities，and perhaps perils，for marketers。

What is TRUE about the private massaging apps？

A.People make fun of each other on these apps.
B.It would make the social media disappear.
C.You need to put private information on them all the time.
D.It builds connection with your real friends.

共用题干
1.Tired of social networking?Logging off Facebook?You're probably not the only one.Fearing for their privacy or perhaps just bored with using the site,100,000 Britons are said to have deactivated（注销）their accounts last month. And Facebook fatigue seems to be catching. Six million logged off for good in the U.S.too,figures show.Worldwide,the rate of growth has slowed for a second month in a row一and as it aims to reach its goal of one billion active users,Facebook is having to rely on developing countries to boost its numbers.The figures suggest that there could be a"natural limit" for Facebook's saturation（饱和）.There is even speculation on blogs that, as is feared for its failing rival MySpace,the website could one day "pass into oblivion"（被人遗忘）.
2.Earlier this year,executives announced that the number of Facebook accounts held in the UK had reached 30 million,accounting for about half the population.The milestone was an increase of four million from last July and represented the highest saturation of any country in Europe.
3.But times change一and last month more than 100,000 in the UK stopped using the website, figures show.In the U.S.,user numbers dropped from 155.2 million to 149.4 million throughout May.In Canada there was also a fall,of about 1.5 million users,while in Russia and Norway num-bers also fell by more than 100,000 users.
4.It's not all bad news for the site.Worldwide,Facebook is still expanding and has around 600 million users,thanks to strong growth in countries such as Mexico and Brazil.
5.According to Eric Eldon,of the website Inside Facebook,which obtained the figures through analysis of the company's advertising tools,there is a point at which the site can no longer grow, once it has established itself in a country."By the time Facebook reaches around 50 percent of the total population in a given country,growth generally slows to a halt,"he explained.

Facebook had strong growth in countries such as_________.
A:around 50 percent of the total population in a given country
B:highest saturation
C:5.8 million
D:Britain,Canada and the U.S.
E:fear for privacy or perhaps just being bored with using the site
F:Mexico and Brazil

A.stay outside the network of social influence
B.have little contact with the source of influence
C.are influenced and then influence others
D.are infuenced by the initial influential