单选题This passage is mainly about ______.A deforestation in the rural agricultural societiesB use of rice husks as an insulation materialC design and use of a solar ovenD maintenance of temperature in a solar oven
题目
单选题
This passage is mainly about ______.
A
deforestation in the rural agricultural societies
B
use of rice husks as an insulation material
C
design and use of a solar oven
D
maintenance of temperature in a solar oven
相似考题
更多“单选题This passage is mainly about ______.A deforestation in the rural agricultural societiesB use of rice husks as an insulation materialC design and use of a solar ovenD maintenance of temperature in a solar oven”相关问题
-
第1题：
A mean sun is used as the reference for solar time for three reasons. Which reason is NOT a cause for use of a mean sun?
A.The motion of the apparent sun is along the ecliptic
B.Measurement of time is along the celestial equator
C.The speed of the Earth's revolution is not constant
D.There are variations in the Earth's rotational speed
正确答案：B
-
第2题：
共用题干
California Gives Green Light to Space Solar Power
Energy beamed down from space is one step closer to reality,now that California has given the green
light to an agreement that would see the Pacific Gas and Electric Company buy 200 megawatts（兆瓦）of power
beamed down from solar-power satellites beginning in 2016.But some major challenges will have to be
overcome if the technology is to be used widely.
A start-up company called Solaren is designing the satellites,which it says will use radio waves to beam
energy down to a receiving station on Earth.
The attraction of collecting solar power in space is the almost uninterrupted sunshine available in geo-
synchronous（与地球同步的）orbit. Earth-based solar cells , by contrast , can only collect sun light during day-
time and when skies are clear.
But space-based solar power must grapple（努力克服）with the high cost per kilogram of launching things in-
to space,says Richard Schwartz of Purdue University in West Lafayette,Indiana."if you're talking about it being
economically viable for power of the Earth,it's a tough go,"he says.
Cal Boerman,Solaren's director of energy services,says the company designed its satellites with a view
to keeping launch costs down."We knew we had to come up with a different,revolutionary design,"he says.
A patent the company has won describes ways to reduce the system's weight,including using inflatable mir-
rors to focus sunlight on solar cells,so a smaller number can collect the same amount of energy.
But using mirrors introduces other challenges,including keeping the solar cells from overheating,says
Schwartz."You have to take care of heat dissipation（散发）because you're now concentrating a lot of energy
in one place,"he says.According to the company's patent,Solaren's solar cells will be connected to radia-
tors to help keep them cool.
Though Boerman says the company believes it can make space-based solar power work,it is not expec-
ting to crowd out other forms of renewable energy.Laws in California and other states require increasing use
of renewable energy in coming years,he points out."To meet those needs,we're going to need all types of
renewable energy sources,"he says.Inflatable mirrors are used to reduce the weight of the space-based solar power system.
A:Right
B:Wrong
C:Not mentioned答案：A解析：根据短文第二段可知，太阳能卫星会使用无线电波将能源发送到地球上的接收站。
短文在第一段中讲太平洋天然气和电力公司将购买200兆瓦的从太阳能电站的卫星上 发送来的电力时提到了200这个数字。
短文在第三段末尾提到：地球上的太阳能电池只能在白天且无云的时候收集阳光。
根据短文第四段可知，在太空的太阳能工厂必须努力克服的问题是：向太空每发射一 千克的物品都要付出高昂代价，即成本高的问题。
根据短文第五段的最后一句可知答案。
根据短文最后一段可知，从太空中获得的太阳能并不会挤掉其他形式的可再生能源。
短文主要围绕美国，尤其是加州来说，并没有提到其他国家的情况。 -
第3题：
共用题干
California Gives Green Light to Space Solar Power
Energy beamed down from space is one step closer to reality,now that California has given the green
light to an agreement that would see the Pacific Gas and Electric Company buy 200 megawatts（兆瓦）of power
beamed down from solar-power satellites beginning in 2016.But some major challenges will have to be
overcome if the technology is to be used widely.
A start-up company called Solaren is designing the satellites,which it says will use radio waves to beam
energy down to a receiving station on Earth.
The attraction of collecting solar power in space is the almost uninterrupted sunshine available in geo-
synchronous（与地球同步的）orbit. Earth-based solar cells , by contrast , can only collect sun light during day-
time and when skies are clear.
But space-based solar power must grapple（努力克服）with the high cost per kilogram of launching things in-
to space,says Richard Schwartz of Purdue University in West Lafayette,Indiana."if you're talking about it being
economically viable for power of the Earth,it's a tough go,"he says.
Cal Boerman,Solaren's director of energy services,says the company designed its satellites with a view
to keeping launch costs down."We knew we had to come up with a different,revolutionary design,"he says.
A patent the company has won describes ways to reduce the system's weight,including using inflatable mir-
rors to focus sunlight on solar cells,so a smaller number can collect the same amount of energy.
But using mirrors introduces other challenges,including keeping the solar cells from overheating,says
Schwartz."You have to take care of heat dissipation（散发）because you're now concentrating a lot of energy
in one place,"he says.According to the company's patent,Solaren's solar cells will be connected to radia-
tors to help keep them cool.
Though Boerman says the company believes it can make space-based solar power work,it is not expec-
ting to crowd out other forms of renewable energy.Laws in California and other states require increasing use
of renewable energy in coming years,he points out."To meet those needs,we're going to need all types of
renewable energy sources,"he says.Space-based solar cells could collect solar power only when skies are clear.
A:Right
B:Wrong
C:Not mentioned答案：B解析：根据短文第二段可知，太阳能卫星会使用无线电波将能源发送到地球上的接收站。
短文在第一段中讲太平洋天然气和电力公司将购买200兆瓦的从太阳能电站的卫星上 发送来的电力时提到了200这个数字。
短文在第三段末尾提到：地球上的太阳能电池只能在白天且无云的时候收集阳光。
根据短文第四段可知，在太空的太阳能工厂必须努力克服的问题是：向太空每发射一 千克的物品都要付出高昂代价，即成本高的问题。
根据短文第五段的最后一句可知答案。
根据短文最后一段可知，从太空中获得的太阳能并不会挤掉其他形式的可再生能源。
短文主要围绕美国，尤其是加州来说，并没有提到其他国家的情况。 -
第4题：
共用题干
Google's Solar Energy Gambit（策略）
Google is making its largest investment yet in clean energy,setting up a $280 million fund to finance home solar rooftop（屋顶）installations.
The search giant announced today it was teaming up with the Silicon Valley's Solar City一a company chaired by Paypal co-founder and Tesla Motors executive Elon Musk一in an effort to break down the biggest barrier to solar energy adoption:the cost."It's a great way to support installations going into more homes,"said Google spokesperson Parag Chokshi.The $280 million fund is the largest fund ever created for residential solar in the United States,according to Solar City,which has raised a total of$I.28 billion in financing capacity during its five-year history.
Google over the past several years has invested in large,utility-scale wind and solar,enhanced geothermal（地热）energy,and other renewable energy projects,for a grand total of more than $680 million in the sector. But today's deal is not only Google's largest foray（突袭）into the sector, it is its first investment in distributed energy. Based in San Mateo,California,less than 20 miles north of Google's Mountain View headquarters,Solar City describes itseff as a solar power service provider. The idea is that people want affordable,clean energy一but they often can't afford to buy a photovoltaic system upfront. Solar City is one of a number of companies that have attempted to help people overcome that cost hurdle（障碍）by leasing,instead of owning their rooftop solar systems.
Solar City's leases and power-purchase agreements to homeowners,businesses,and schools promise a lower monthly electricity bill(including a set payment to Solar City in addition to utility payments)than customers would get with their usual electricity from the grid.Solar City not only finances these photovoltaic projects,but also designs,installs,monitors,and maintains the systems. Recently,since buying the assets of a company called Business Solutions last year,Solar City has also begun offering energy audits and small home improvements(like installing programmable thermostats)that can make a big difference in energy use.
Until now,Solar City has financed most of its 15,000 projects through banks,Chief Executive Lyndon Rive said in an interview. But the problem is only about a half dozen banks are doing solar financing,he said.So in order for Solar City's model to achieve"true scale,"it must"unleash the available capital of corporate America,"he said.Rive is hopeful that Google's move today will set an example for other corporations to make similar investments.The biggest barrier to solar energy adoption is the cost.
A:Right
B:Wrong
C:Not mentiond答案：A解析：题干意思为：谷歌是全球最大的清洁能源公司。通过文中第二段第一句中“这个搜索巨擎……”，可以看出谷歌是个搜索引擎公司（通过常识也可以判断出）。而谷歌是否是全球最大的清洁能源公司，文中并没有给出明确说法，所以选择C。
题干意思为：使用太阳能的最大障碍是成本问题。通过文中第二段第一句中in an effort to break down the biggest barrier to solar energy adoption : the cost（致力于消除太阳能应用的最大障碍：成本）可以得出，文中表达与题干意思表达一致，所以题干表述正确。
题干意思为：谷歌对太阳能的投入已经超过6.8亿美元。文中第三段第一句：Google over the past several years has invested in large , utility-scale wind and solar , enhanced geothermal energy,and other renewable energy projects,for a grand total of more than $680 million in the sector．过去这些年来，谷歌在大规模、可利用的风能、太阳能、加强地热能源和其他新能源工程上投资达到6.8亿美元。可以得出6.8亿美元并非全部投入到太阳能领域，还有风能、加强地热能等其他能源领域，所以题干意思与原文意思相悖，应选择B。
题干意i思为：太阳城是美国一座城市的名字。通过第二段第一句中a company chaired by可知Solar City是一个公司。显而易见，题干表达错误，选择B项。
题干意思为：太阳城通过银行融资，资助了15 000个项目。文中最后一段第一句：Until now , Solar City has financed most of its 15 ,000 projects through banks．到目前为止，太阳城通过银行融资资助了其15 000个项目中的大多数。说明太阳城还没有全部资助15 000 个项目，所以题干意思表达不准确，选择B。
题干意思为：除了谷歌，还没有其他公司投资太阳能。文中最后一句： Rive is hopeful that Google's move today will set an example for other corporations to make similar investments.Rive希望谷歌的行动能够为其他公司投资清洁能源做出表率。可以得出，目前除了谷歌，还没有其他公司投资太阳能。
题干意思为：谷歌的行动是其他公司投资清洁能源的表率。从文中最后一句可以得出该结论，所以题干表述正确。 -
第5题：
单选题According to the passage9 which of the following statements is NOT TRUE?ASolar panels are very expensive to install.
BSheridan Community Schools is completely solar-powered.
CIn 2014, fewer than l,000 schools used solar power in the US.
DMore and more schools are switching to solar power to cut costs.
正确答案： C解析： -
第6题：
单选题The passage is about the use of energy from ______.Athe sun
Bthe wind
Cthe water
Dthe oil
正确答案： D解析：
该篇录音介绍了solar power使用方面所面临的难题及可能的解决途径，因此选A。energy from the sun指的就是“solar power”。 -
第7题：
单选题It can be concluded from the passage that ______.Ait is hopeful to bring solar energy into average households
Bit is feasible to use nuclear energy to run home appliances
Cit is economical to use water to heat houses
Dit is possible to use wind to power machines
正确答案： A解析：
录音中指出通过使用hybrid nanorod polymer composite可以极大降低利用太阳能的成本，虽然目前为止nanorod polymer cells的转换效率只是2%多一点，但是研究者相信效率能得到极大提高，由此可推断太阳能在普通家庭的使用是有望实现的。
【录音原文】
Millions of people around the world would like to heat their homes and run household appliances with solar power. But the cost of doing so puts it out of the question. The first problem is that the cells convert only 10％-15％of the radiation from the sun into energy. The second is that the photovoltaic (PV) material used is a form of silicon that has to be made under high vacuum conditions and heated in special kilns to 1.400℃. That makes photovoltaic solar cells horrendously expensive.
How to bring the high costs down to a more manageable amount? One answer that is attracting attention is to use carbon “nanorods”, superstrong cylinders of carbon atoms that are 75, 000 times thinner than a human hair. If scientists succeed in their efforts, carbon-based solar cells could cost as little as a tenth of the price of today’s silicon-based versions.
By placing the flexible nanorods in a polymer solution, researchers found it could produce a composite material that had the elasticity and pliability of plastic, but capable converting solar rays into electrical energy. Inorganic nanocrystals behave a lot like polymers. For instance, they can be processed while still in the form of a solution. Scientists had been working with plastics as an alternative to conventional solar cells, but found that they did not conduct electricity particularly well.
Compared with the arduous process of fabricating conventional solar cells, making the hybrid nanorod polymer composite would be more like manufacturing cheap plastic laminates. That could solve the cost part of the solar energy equation. But what about the conversion efficiency? So far, the conversion efficiency of nanorod polymer cells has been little more than 2％. However, researchers are confident that the efficiency can be improved considerably. -
第8题：
单选题According to the passage, which of the following is TRUE?ACell phone use is dangerous.
BCell phone use causes cancer.
CThe human brain is an electromagnetic field.
DThere are about 5 billion cell phone users in the world right now.
正确答案： B解析： -
第9题：
单选题Very soon you will be performing maintenance operations. You would have several jobs to run as soon as the maintenance period starts. Which method would you use to create jobs without specifying the time period when the job should be run？（）Ause DBMS_IJOB package
Buse Oracle Scheduler
Cuse DBMS_JOB package
Duse Oracle Data Pump Export and Import
正确答案： B解析： 暂无解析 -
第10题：
单选题What is the fourth paragraph of the passage mainly about?AThe ways to use solar power.
BThe advantages of solar power.
CThe places to build the solar power plants.
DThe difficulties of putting solar power to use widely.
正确答案： B解析：
主旨大意题。本段主要介绍的是把太阳能投入广泛使用需要的条件以及遇到的困难。 -
第11题：
单选题A sidereal day is shorter than a solar day. This difference is due to（）.Airregularities in the daily rotational rate of the Sun
Bthe space motion of the solar system
Cthe precession of the equinoxes
Dthe use of different reference points
正确答案： D解析： 暂无解析 -
第12题：
问答题Practice 3 You should spend about 40 minutes on this task. Write about the following topic: Fossil fuels, such as coal, oil, natural gas, are used in many countries. But in some countries, the use of alternative sources of energy, including wind and solar power, are encouraged. Is this trend a positive or a negative development? You should write at least 250 words.正确答案： 【参考范文】
The competition between nations largely depends on who can have a head start in energy after Industrial Revolution, as many mainstream energy sources are not renewable. Some people believe that traditional fuels, namely coal, oil, and gas, are the main sources rather than alternative sources like wind energy and solar energy. In my opinion, alternative sources of energy should be encouraged to utilize throughout the world.
Human beings’ use of energy in fossil fuels has had a long history and already gained popularity in most countries. Nonetheless, those traditional resources are exhaustible and will dry up in a foreseeable future. Alternative ways should be found for a sustainable future.
There are mainly two benefits of using alternative resource: Firstly, most new energies are green, i.e. environmental friendly, and using alternative sources reduce the environmental pollution.. Secondly, alternative sources of energy are regarded as relatively more sustainable, and are more likely to meet the increasing demands of social and cultural development in modern society. It is often considered, however, that using alternative sources of energy such as nuclear energy is a quite dangerous thing for human beings and our planet. Some other alternative sources of energy like wind energy and solar energy are not quite effective for the sake of huge cost.
In summary, the use of the alternative sources can accelerate social development and push the whole world forward rapidly, which does no harm to the environment and has high effectiveness. As technology advances day by day, it is hopeful that all the countries can use green energy at a low cost.解析： 暂无解析 -
第13题：
共用题干
California Gives Green Light to Space Solar Power
Energy beamed down from space is one step closer to reality,now that California has given the green
light to an agreement that would see the Pacific Gas and Electric Company buy 200 megawatts（兆瓦）of power
beamed down from solar-power satellites beginning in 2016.But some major challenges will have to be
overcome if the technology is to be used widely.
A start-up company called Solaren is designing the satellites,which it says will use radio waves to beam
energy down to a receiving station on Earth.
The attraction of collecting solar power in space is the almost uninterrupted sunshine available in geo-
synchronous（与地球同步的）orbit. Earth-based solar cells , by contrast , can only collect sun light during day-
time and when skies are clear.
But space-based solar power must grapple（努力克服）with the high cost per kilogram of launching things in-
to space,says Richard Schwartz of Purdue University in West Lafayette,Indiana."if you're talking about it being
economically viable for power of the Earth,it's a tough go,"he says.
Cal Boerman,Solaren's director of energy services,says the company designed its satellites with a view
to keeping launch costs down."We knew we had to come up with a different,revolutionary design,"he says.
A patent the company has won describes ways to reduce the system's weight,including using inflatable mir-
rors to focus sunlight on solar cells,so a smaller number can collect the same amount of energy.
But using mirrors introduces other challenges,including keeping the solar cells from overheating,says
Schwartz."You have to take care of heat dissipation（散发）because you're now concentrating a lot of energy
in one place,"he says.According to the company's patent,Solaren's solar cells will be connected to radia-
tors to help keep them cool.
Though Boerman says the company believes it can make space-based solar power work,it is not expec-
ting to crowd out other forms of renewable energy.Laws in California and other states require increasing use
of renewable energy in coming years,he points out."To meet those needs,we're going to need all types of
renewable energy sources,"he says.Solaren is going to design 200 solar-power satellites.
A:Right
B:Wrong
C:Not mentioned答案：C解析：根据短文第二段可知，太阳能卫星会使用无线电波将能源发送到地球上的接收站。
短文在第一段中讲太平洋天然气和电力公司将购买200兆瓦的从太阳能电站的卫星上 发送来的电力时提到了200这个数字。
短文在第三段末尾提到：地球上的太阳能电池只能在白天且无云的时候收集阳光。
根据短文第四段可知，在太空的太阳能工厂必须努力克服的问题是：向太空每发射一 千克的物品都要付出高昂代价，即成本高的问题。
根据短文第五段的最后一句可知答案。
根据短文最后一段可知，从太空中获得的太阳能并不会挤掉其他形式的可再生能源。
短文主要围绕美国，尤其是加州来说，并没有提到其他国家的情况。 -
第14题：
共用题干
California Gives Green Light to Space Solar Power
Energy beamed down from space is one step closer to reality,now that California has given the green
light to an agreement that would see the Pacific Gas and Electric Company buy 200 megawatts（兆瓦）of power
beamed down from solar-power satellites beginning in 2016.But some major challenges will have to be
overcome if the technology is to be used widely.
A start-up company called Solaren is designing the satellites,which it says will use radio waves to beam
energy down to a receiving station on Earth.
The attraction of collecting solar power in space is the almost uninterrupted sunshine available in geo-
synchronous（与地球同步的）orbit. Earth-based solar cells , by contrast , can only collect sun light during day-
time and when skies are clear.
But space-based solar power must grapple（努力克服）with the high cost per kilogram of launching things in-
to space,says Richard Schwartz of Purdue University in West Lafayette,Indiana."if you're talking about it being
economically viable for power of the Earth,it's a tough go,"he says.
Cal Boerman,Solaren's director of energy services,says the company designed its satellites with a view
to keeping launch costs down."We knew we had to come up with a different,revolutionary design,"he says.
A patent the company has won describes ways to reduce the system's weight,including using inflatable mir-
rors to focus sunlight on solar cells,so a smaller number can collect the same amount of energy.
But using mirrors introduces other challenges,including keeping the solar cells from overheating,says
Schwartz."You have to take care of heat dissipation（散发）because you're now concentrating a lot of energy
in one place,"he says.According to the company's patent,Solaren's solar cells will be connected to radia-
tors to help keep them cool.
Though Boerman says the company believes it can make space-based solar power work,it is not expec-
ting to crowd out other forms of renewable energy.Laws in California and other states require increasing use
of renewable energy in coming years,he points out."To meet those needs,we're going to need all types of
renewable energy sources,"he says.Many countries will grant permission for the use of space-based solar power soon.
A:Right
B:Wrong
C:Not mentioned答案：C解析：根据短文第二段可知，太阳能卫星会使用无线电波将能源发送到地球上的接收站。
短文在第一段中讲太平洋天然气和电力公司将购买200兆瓦的从太阳能电站的卫星上 发送来的电力时提到了200这个数字。
短文在第三段末尾提到：地球上的太阳能电池只能在白天且无云的时候收集阳光。
根据短文第四段可知，在太空的太阳能工厂必须努力克服的问题是：向太空每发射一 千克的物品都要付出高昂代价，即成本高的问题。
根据短文第五段的最后一句可知答案。
根据短文最后一段可知，从太空中获得的太阳能并不会挤掉其他形式的可再生能源。
短文主要围绕美国，尤其是加州来说，并没有提到其他国家的情况。 -
第15题：
共用题干
Google's Solar Energy Gambit（策略）
Google is making its largest investment yet in clean energy,setting up a $280 million fund to finance home solar rooftop（屋顶）installations.
The search giant announced today it was teaming up with the Silicon Valley's Solar City一a company chaired by Paypal co-founder and Tesla Motors executive Elon Musk一in an effort to break down the biggest barrier to solar energy adoption:the cost."It's a great way to support installations going into more homes,"said Google spokesperson Parag Chokshi.The $280 million fund is the largest fund ever created for residential solar in the United States,according to Solar City,which has raised a total of$I.28 billion in financing capacity during its five-year history.
Google over the past several years has invested in large,utility-scale wind and solar,enhanced geothermal（地热）energy,and other renewable energy projects,for a grand total of more than $680 million in the sector. But today's deal is not only Google's largest foray（突袭）into the sector, it is its first investment in distributed energy. Based in San Mateo,California,less than 20 miles north of Google's Mountain View headquarters,Solar City describes itseff as a solar power service provider. The idea is that people want affordable,clean energy一but they often can't afford to buy a photovoltaic system upfront. Solar City is one of a number of companies that have attempted to help people overcome that cost hurdle（障碍）by leasing,instead of owning their rooftop solar systems.
Solar City's leases and power-purchase agreements to homeowners,businesses,and schools promise a lower monthly electricity bill(including a set payment to Solar City in addition to utility payments)than customers would get with their usual electricity from the grid.Solar City not only finances these photovoltaic projects,but also designs,installs,monitors,and maintains the systems. Recently,since buying the assets of a company called Business Solutions last year,Solar City has also begun offering energy audits and small home improvements(like installing programmable thermostats)that can make a big difference in energy use.
Until now,Solar City has financed most of its 15,000 projects through banks,Chief Executive Lyndon Rive said in an interview. But the problem is only about a half dozen banks are doing solar financing,he said.So in order for Solar City's model to achieve"true scale,"it must"unleash the available capital of corporate America,"he said.Rive is hopeful that Google's move today will set an example for other corporations to make similar investments.Google is the biggest clean energy company in the world.
A:Right
B:Wrong
C:Not mentiond答案：C解析：题干意思为：谷歌是全球最大的清洁能源公司。通过文中第二段第一句中“这个搜索巨擎……”，可以看出谷歌是个搜索引擎公司（通过常识也可以判断出）。而谷歌是否是全球最大的清洁能源公司，文中并没有给出明确说法，所以选择C。
题干意思为：使用太阳能的最大障碍是成本问题。通过文中第二段第一句中in an effort to break down the biggest barrier to solar energy adoption : the cost（致力于消除太阳能应用的最大障碍：成本）可以得出，文中表达与题干意思表达一致，所以题干表述正确。
题干意思为：谷歌对太阳能的投入已经超过6.8亿美元。文中第三段第一句：Google over the past several years has invested in large , utility-scale wind and solar , enhanced geothermal energy,and other renewable energy projects,for a grand total of more than $680 million in the sector．过去这些年来，谷歌在大规模、可利用的风能、太阳能、加强地热能源和其他新能源工程上投资达到6.8亿美元。可以得出6.8亿美元并非全部投入到太阳能领域，还有风能、加强地热能等其他能源领域，所以题干意思与原文意思相悖，应选择B。
题干意i思为：太阳城是美国一座城市的名字。通过第二段第一句中a company chaired by可知Solar City是一个公司。显而易见，题干表达错误，选择B项。
题干意思为：太阳城通过银行融资，资助了15 000个项目。文中最后一段第一句：Until now , Solar City has financed most of its 15 ,000 projects through banks．到目前为止，太阳城通过银行融资资助了其15 000个项目中的大多数。说明太阳城还没有全部资助15 000 个项目，所以题干意思表达不准确，选择B。
题干意思为：除了谷歌，还没有其他公司投资太阳能。文中最后一句： Rive is hopeful that Google's move today will set an example for other corporations to make similar investments.Rive希望谷歌的行动能够为其他公司投资清洁能源做出表率。可以得出，目前除了谷歌，还没有其他公司投资太阳能。
题干意思为：谷歌的行动是其他公司投资清洁能源的表率。从文中最后一句可以得出该结论，所以题干表述正确。 -
第16题：
单选题Oil is a nonrenewable resource, whereas sunshine is limitless. So why not run cars on solar power? Because a car powered by solar collecting panels would be fine on a sunny day, but as soon as the sun went behind a cloud, the car would no longer function. Which of the following is presupposed in the argument against running a car on solar power?ASolar power is cleaner than fossil fuels, and it involves less geopolitical risk.
BIn most of the northern hemisphere, it can be expected that more than 150 days a year will be cloudy.
CNo system exists for storing solar energy for a car’s use when the car is not in direct sunlight.
DNo one has yet introduced a commercially viable process for mass-producing solar cells that convert more than 10 percent of incoming sunlight into usable energy.
EConsumers accustomed to the rapid acceleration of gasoline-powered cars will not accept the weak acceleration of solar-powered cars.
正确答案： C解析：
文段中提到，只要太阳一下山太阳能轿车就无法使用，可以推断得出此结论的前提是：不存在某种太阳能存储装置，故本题应选C项。 -
第17题：
问答题What is the passage mainly about?正确答案： Urban environment pollution and damage.解析：
主旨大意题。本文的主要内容描述了城市固体垃圾及污水得不到及时有效的处理，从而造成对环境的污染和破坏的状况。 -
第18题：
单选题According to the passage, the use of an adjustable mirror increases the oven temperature by ______.A80-120 degrees Celsius
Bat least 80 degrees Celsius
Cup to 30 degrees Celsius
Dup to 15 degrees Celsius
正确答案： D解析：
题干中的关键词为adjustable mirror，从而定位到第二段倒数第五句，该句指出安装在炉箱一旁的adjustable mirror可把太阳光反射到炉箱内部，从而把温度提升到15-30 degrees Celsius（摄氏度），可知该可调镜可将炉箱温度最高提升到30摄氏度，故选C。 -
第19题：
单选题According to the passage, the greatest part of the solar energy that reaches the Earth is _____.Areflected back to space by snow and ice
Bconcentrated at visible wavelengths
Cabsorbed by carbon dioxide molecules
Dabsorbed by atmospheric water vapor
正确答案： D解析：
根据文章第一段第二句可知，“these molecules allow radiation at visible wavelengths, where most of the energy of sunlight is concentrated, to pass through”，由此可以推断选项B是正确的。 -
第20题：
单选题According to the passage, solar energy has the following benefits EXCEPT that______.Ait creates no pollution
Bit can save money
Csolar panels are easy to maintain
Dsolar energy is renewable
正确答案： B解析： -
第21题：
单选题A mean sun is used as the reference for solar time for three reasons. Which reason is NOT a cause for use of a mean sun?（）AThe motion of the apparent sun is along the ecliptic
BMeasurement of time is along the celestial equator
CThe speed of the Earth's revolution is not constant
DThere are variations in the Earth's rotational speed
正确答案： C解析： 暂无解析 -
第22题：
单选题We learn from the passage that ______.Aall living things on the earth depend on the sun for their food
Ba forest looks dark in winter because it absorbs solar energy
Conly 0.023 of the energy from the sun is made use of on the earth
Dgreenhouse gases allow heat energy to escape from the earth’ s surface
正确答案： A解析：
根据第一段Sunlight also provides the energy used by green plants to make their own food，阳光给绿色植物提供能量使其生产自己的食物，故选A。 -
第23题：
单选题Which point is Mr. Pat NOT concerned about?ACoverage of environmental opposition
BThe article's figure of 75％
CTechnical terminology related to the project
DThe article's doubts about solar power output
正确答案： B解析：
邮件第二段开头提到了电厂的负面影响，但是反对的声音只是很小部分，对应A项；第一篇文章的数据是75%，而邮件第一段最后一句提到的数据是80%，对应B项；邮件第一段中间“you say the project will utilize photovoltaic solar technology, but this is incorrect. The primary technology to be featured at the ECV-12 facility will be thermoelectric”可知电厂使用的热电技术，对应C项；只有D项在文中未提及。选择D。