What will be the benefit if the research on smart windows turns out to be successful, according to the last paragraph?A.The buildings will look different.B.Windows can be as large as you want.C.We may not need air conditioners any more.D.They are less exp

题目

What will be the benefit if the research on smart windows turns out to be successful, according to the last paragraph?

A.The buildings will look different.

B.Windows can be as large as you want.

C.We may not need air conditioners any more.

D.They are less expensive than traditional windows.


相似考题

2.Smart WindowWindows not only let light in to cut down an electricity use for lighting, but the light coming through the window also provides heat. However, windows are not something people typically associate with being a cutting edge technology. Researchers are now working on new technologies that enable a window to quickly change from clear to dark and anywhere in between with a flip of a switch."It took us a long time to figure out what a window really is," says Claes Granqvist. He's a professor of solid-state physics at Uppsala University in Sweden. "It's contact with the outside world. You have to have visual contact with the surrounding world to feel well. " So, windows and natural light are important for improving the way people feel when they're stuck indoors.Yet, windows are the weak link in a building when it comes to energy and temperature control. In the winter, cold air leaks in. When it's hot and sunny, sunlight streams in. All of this sunlight carries lots of heat and energy. And all of this extra heat forces people to turn on their air conditioners. Producing blasts of cold air, which can feel so refreshing, actually suck up enormous amounts of electricity in buildings around the world.Windows have been a major focus of energy research for a long time. Over the years, scientists have come up with a variety of strategies for coating, glazing, and layering windows to make them more energy efficient. Smart windows go a step further. They use chromogenic technologies which involve changes of color.Electrochromic windows use electricity to change color. For example, a sheet of glass coated with thin layers of chemical compound such as tungsten oxide works a bit like a battery. Tungsten oxide is clear when an electric charge is applied and dark when the charge is removed, that is, when the amount of voltage is decreased, the window darkens until it's completely dark after all electricity is taken away. So applying a voltage determines whether the window looks clear or dark.One important feature that makes a smart window so smart is that it has a sort of "memory. " All it takes is a small jolt of voltage to turn the window from one state to the other. Then, it stays that way. Transitions take anywhere from 10 seconds to a few minutes, depending on the size of the window. The development of smart windows could mean that massive air conditioning systems may no longer need. "In the future," Granqvist says, "our buildings may look different. "Which of the following statements does not indicate the importance of windows as described in the first two paragraphs?A.Windows can change from clear to dark to save energy.B.Windows help to save energy by letting light in.C.Windows help to save energy by providing heat.D.Windows enable people to have contact with the outside world.

更多“What will be the benefit if the research on smart windows turns out to be successful, according to the last paragraph?A.The buildings will look different.B.Windows can be as large as you want.C.We may not need air conditioners any more.D.They are less exp”相关问题
  • 第1题:

    According to Paragraph 2, some organizations check their systems to find out

    [A] whether there is any weak point.

    [B] what sort of data has been stolen.

    [C] who is responsible for the leakage.

    [D] how the potential spies can be located.


    正确答案:A

  • 第2题:

    According to the passage, which of the following statement is true? __________.

    A. People can know happiness at any age.

    B. A happy person lives a successful life.

    C. Enjoying what you have can make you happy.

    D. Parents want to pursue the study of happiness.


    正确答案:C
    逻辑推理题。由文中第四段最后一句“Happiness is the capacity…you don’t have.”(快乐是享受自己拥有的事物的能力,而非对自己没有的事物的渴望。)可推断选项C正确,其余各项文中均未提及。

  • 第3题:

    E

    All too often , a choice that seems sustainable(可持续的)turns out on closer examination to be problematic. Probably the best example is the rush to produce ethanol(乙醇)for fuel from corn . Corn is a renewable resource —you can harvest it and grow more, almost limitlessly . So replacing gas with corn ethanol seems like a great idea .

    One might get a bit more energy out of the ethanol than that used to make it, which could still make ethanol more sustainable than gas generally, but that’s not the end of the problem. Using corn to make ethanol means less corn is left to feed animals and people, which drives up the cost of food. That result leads to turning the fallow land — including, in some cases, rain forest in places such as Brazil — into farmland, which in turn gives off lots of carbon dioxide(CO2)into the air. Finally, over many years, the energy benefit from burning ethanol would make up for the forest loss. But by then, climate change would have progressed so far that it might not help.

    You cannot really declare any practice “sustainable” until you have done a complete lift-cycle analysis of its environmental(环境的)costs. Even then, technology and public policy keep developing, and that development can lead to unforeseen and undesired results. The admirable goal of living sustainable requires plenty of thought on an ongoing basis.

    57. What might directly cause the loss of the forest according to the text?

    A. The growing demand for energy to make ethanol.

    B. The increasing carbon dioxide in the air.

    C. The greater need for farmland.

    D. The big change in weather.


    正确答案:C

  • 第4题:

    Forces other than damaging winds are also at work inside tornadoes (龙卷风) . Sometimes,as the wind passes a house, the walls and ceiling burst apart as if a bomb had gone off inside. This explosion is caused by the low air pressure at the center of a tornado.

    The pressure at the center of a tornado is usually 13 pounds per square inch. However,inside the house the air pressure is normal, about 15 pounds per square inch.The difference of 2 pounds per square inch between the inside and outside pressure may not seem like much. But suppose a tornado passes over a small building that measures 20 by 10 by feet. On each square inch of the building, there is 2 pounds of pressure from the inside

    that is not balanced by air pressure outside the building. On the ceiling, that adds up to an unbalanced pressure of 57600 pounds. The pressure of the four walls adds up to 172800 pounds.

    If windows are open in the building, some of the inside air will rush out through them.This will balance the pressure inside and outside the building.But if the windows are shut tightly, the huge inside pressure may cause the building to burst.

    Unfortunately, heavy rain often occurs in the storms that later produce tornadoes,so people often shut their windows. This may cause far worse damage later.

    21、 What did the paragraph before this passage most probably discuss?

    A、 Measuring rainfall from a storm

    B、 The kinds of damage caused by explosions

    C、 The powerful winds of tornadoes

    22、 Which of the following is the main topic of the passage?

    A、 How tornadoes can be prevented

    B、 When tornadoes usually occur

    C、 Why tornadoes cause so much damage

    23、 Tornadoes can destroy buildings because the()

    A、 force of a tornado increases the air pressure in a building

    B、 air pressure inside a tornado is less than the air pressure inside a building

    C、 air pressure at the center of a tornado is over 172000 pounds

    24、 What is the difference per square inch between the air pressure inside a building and the air pressure inside a tornado?

    A、 2 pounds

    B、 13 pounds

    C、 15 pounds

    25、 What would happen if the windows are shut tightly in the stormy weather?

    A、 Tornadoes may be formed

    B、 The house may be apart

    C、 There may not be any pressure inside the building


    参考答案:21、B 22、B 23、A 24、C 25、C


  • 第5题:

    下面哪些句子表示"我可以帮您什么忙吗?"()

    A、What can I do for you?

    B、Can I help you?

    C、May I help you?

    D、Can I be of any service to you?


    参考答案:ABCD

  • 第6题:

    请阅读短文,完成此题。
    What should you think about in trying to find your career? You are probably better at some school subjects than others. These may show strengths that you can use in your work. A boy who is good at mathematics can use that in an engineering career. A girl who spells well and likes English may be good at office work. So it is important to know the subjects you do well in at school. On the other hand, you may not have any specially strong or weak subjects but your records show a general satisfactory standard. Although not all subjects can be used directly in a job, they may have indirect value. Knowledge of history is not required for most jobs but if history is one of your good subjects you will have learned to remember facts and details. This is an ability that can be useful in many jobs.
    Your school may have taught you skills, such as typing or technical drawing, which you can use in your work. You may be good at metal work or cookery and look for a job where you can improve these skills.
    If you have had a part-time job on Saturdays or in the summer, think what you gained from it. If nothing else, you may have learned how to get to work on time, to follow instructions and to get on with older workers. You may have learned to give correct change in a shop, for example. Just as important, you may become interested in a particular industry or career you see from the inside in apart-time job. Facing your weak points is also part of knowing yourself. You may be all thumbs when you handle tools; perhaps you are a poor speller or cannot add up a column of figures. It is bitter to face any weaknesses than to pretend they do not exist. Your school record, for instance, may not be too good, yet it is an important part of your background. You should not be apologetic about it but instead recognize that you will have a chance of a fresh start at work.

    Which of the following best sums up the first paragraph?
    查看材料

    A.The importance of doing well at school.
    B.Using school performance to help to choose a career.
    C.The importance of being good at all subjects.
    D.The indirect value of schoolwork.

    答案:B
    解析:
    从第一段的第一、二句可以看出本段在讨论找工作和在学校的表现的关系,而全段都在说那些科目和那些工作,因此可以推断出答案是B。

  • 第7题:

    According to Paragraph 4, smart windows are the windows that_____.

    A.are costed.
    B.are glazed.
    C.have several layers.
    D.can change color.

    答案:D
    解析:

  • 第8题:

    When you want to go shopping, decide how much money you can spend for new clothes.Think about the kind of clothes you really need.Then look for those clothes on sale (销售).
    There are labels (标签) inside all new clothes.The labels tell you how to take care of your clothes.The label for a shirt may tell you to wash it in warm water.A sweater label may tell you to wash by washing in cold water.The label on a coat may say "dry clean only." Washing may ruin(损坏) this coat.If you do as the directions (说明) say on the label ,you can keep your clothes looking their best.Many clothes today must be dry cleaned.Dry cleaning is expensive.When buying new clothes,check (核实) to see if they will need to be dry cleaned.You will save money if you buy clothes that can be washed.
    You can save money if you buy clothes that are well made.Well - made clothes last longer.
    They look good even after they have been washed many times.Clothes that cost more money are not always better made.They do not always fit (合身) better.Sometime less expensive clothes look and fit better than more expensive clothes.
    The best title (标题) for the reading should be__________.

    A.Buying Less Expensive Clothes
    B.Taking Enough Money When Shopping
    C.Being a Clever Clothes Shopper
    D.Choosing the Labels inside New Clothes

    答案:C
    解析:
    此题为概括题。此题考查文章的标题,主要针对文章的主题、中心思想、文章的结构层次(主题句或主题段),要求学生在理解全文后归纳短文要点,概括中心思想。考生归纳各段的主题句不难发现此题答案选择C。

  • 第9题:

    When you want to go shopping, decide how much money you can spend for new clothes.Think about the kind of clothes you really need.Then look for those clothes on sale (销售).
    There are labels (标签) inside all new clothes.The labels tell you how to take care of your clothes.The label for a shirt may tell you to wash it in warm water.A sweater label may tell you to wash by washing in cold water.The label on a coat may say "dry clean only." Washing may ruin(损坏) this coat.If you do as the directions (说明) say on the label ,you can keep your clothes looking their best.Many clothes today must be dry cleaned.Dry cleaning is expensive.When buying new clothes,check (核实) to see if they will need to be dry cleaned.You will save money if you buy clothes that can be washed.
    You can save money if you buy clothes that are well made.Well - made clothes last longer.
    They look good even after they have been washed many times.Clothes that cost more money are not always better made.They do not always fit (合身) better.Sometime less expensive clothes look and fit better than more expensive clothes.
    If you want to save money you can buy clothes that__________.

    A.don't fit you
    B.don't last long
    C.need to be dry cleaneD.
    D.can be washeD.

    答案:D
    解析:
    此题为理解题。从第二段“Dry cleaning is expensive.You will save money if you buy clothes that can be washed.”可以看出C不对,又可以从第三段很容易判断出A和B不对。

  • 第10题:

    Research Is a State of Mind For many years there has been much misunderstanding as to just what research is. The popular conception seems to be that there is something mysterious about it, and before any research can be done it is necessary to have expensive scientific apparatus and large, elaborately equipped laboratories. Actually, this is not so. (6) It is a simple, organized way of trying to accomplish something you wish to do—so simple that anyone can do research anywhere at any time. First, you select the problem you would like to solve, then you list at least ten reasons why it has not been solved. (7) It takes just as much effort to solve a useless problem as a useful one. (8) After carefully—and I want to emphasize that word “carefully”—selecting the problem and the ten things between you and the solution, you then use the same procedure as in solving a crossword puzzle.(9)In the solution of the remaining obstacles you may need some simple apparatus, but the things you will probably need most are infinite patience and persistence. Few people realize the difficulties of doing any new thing. Maybe one of the reasons people are so easily discouraged is because of their education. During all our years at school we were examined two or three times a year. If we failed once, we were out. (10)If we are going to make progress, we must learn to fail intelligently so that we won't become discouraged at the 99.9 per cent failure. 9.()

    • A、Make sure the game is worth the candle.
    • B、That is a step in the right direction, but I don't believe it is enough.
    • C、You take the easy obstacles first and by a process of elimination you eventually arrive at the one or two major ones.
    • D、But in selecting the problem, you need to be sure to analyze it carefully to see that it is worth the effort.
    • E、Research isn't a physical thing at all; it's a state of mind.
    • F、By contrast, all research work is 99. 9 per cent failure and, if we succeed once, we are in.

    正确答案:C

  • 第11题:

    单选题
    According to paragraph 2, some organizations check their systems to find out ______.
    A

    whether there is any weak point

    B

    what sort of data has been stolen

    C

    who is responsible for the leakage

    D

    how the potential spies can be located


    正确答案: A
    解析:
    细节理解题。答案出自第二段:Several massive leakages…have left managers hurriedly peering into their intricate 11 systems and business processes in search of potential vulnerabilities.

  • 第12题:

    单选题
    In the last paragraph the author points out that ______.
    A

    sleeping less is good for human health

    B

    people ought to be persuaded to sleep less than before

    C

    it is incorrect to say that people sleep too little

    D

    those who can sleep less should be encouraged


    正确答案: D
    解析:
    最后一段作者描述到一些人认为更多的人睡得太多,作者指出“One can see the point of this also”,接着下文提到有些人在睡眠量低于平均水平的情况下也能把做好工作并玩得愉快,如果这样不会对他们身体造成伤害,那么“retard our development by holding back those people”将是遗憾的事情,可见作者认为那些人应该得到支持,因此D项符合文意。

  • 第13题:

    According to the last paragraph, most Asian central banks are becoming _____.

    [A] rather regretful

    [B] less ambitious

    [C] more cautious

    [D] speculative


    正确答案:C

    本题考查推理引申。文章最后一段第二句提到,一直以来作为美国国债最大的外国买家的亚洲中央银行最近改变了过去的做法。接着该段以具体数据说明外国买家购买美国国债的数量下降。从文中“swallowing American government debt like there was no tomorrow”可看出作者认为大举购买国债的做法是“不谨慎”的,而下文“have had second thoughts”他表明它变得更加慎重,因此[C]为正确答案。

  • 第14题:

    According to the last paragraph, it is important to____________.

    A. eat something for breakfast B. be careful about what you eat

    C. heat up food before eating it D. eat calorie-controlled food


    正确答案:A

  • 第15题:

    According to the last paragraph, it is important to____________.

    A.eat something for breakfast

    B.be careful about what you eat

    C.heat up food before eating it

    D.eat calorie-controlled food


    正确答案:A

  • 第16题:

    From what you _____, you can understand why an object weighs less in water than in air.

    A、had learnt

    B、will learn

    C、have learnt

    D、can learn


    参考答案:C

  • 第17题:

    why do you need to take the lube oil sample for analysis ? in the analyzing , what can you possibly find ?and if you find these substances ,what are the possible problems the engines may have ?why ?


    正确答案:At least ,every three months ..by analyzing the samples of the lube oil ,I can find such things as metal dust ,viscosity ,and other impurities ,this is preventive measures in engine maintenance ..for example ,if I find metal (aluminum ,copper etc )inside the lube oil ,maybe something wrong with the engine and part of the engine is broken .

  • 第18题:

     Smart Windows
      1.Windows not only let light in to cut down an electricity use for lighting, but the light coming through the window also provides heat. However, windows are not something people typically associate with being a cutting edge technology. Researchers are now working on new technologies that enable a window to quickly change from clear to dark and anywhere in between easily.
      2."It took us a long time to figure out what a window really is," says Claes Granqvist. He's a professor of solid-state physics at Uppsala University in Sweden. "It's contact with the outside world. You have to have visual contact with the surrounding world to feel well." So, windows and natural light are important for improving the way people feel when they're stuck indoors.
      3.Yet, windows are the weak link in a building when it comes to energy and temperature control. In the winter, cold air leaks in. When it's hot and sunny, sunlight streams in. All of this sunlight carries lots of heat and energy. And all of this extra heat forces people to turn on their air conditioners. Producing cold air, which can feel so refreshing(使人清新的), actually suck up enormous amounts of electricity in buildings around the world.
      4.Windows have been a major focus of energy research for a long time. Over the years, scientists have come up with a variety of strategies for coating, glazing(用玻璃覆盖), and layering windows to make them more energy efficient. Smart windows go a step further. They use some chromogenic(发色的)technologies involving changes of color.
      5.Electrochromic(电致色的) windows use electricity to change color. For example, a sheet of glass coated with thin layers of tungsten oxide(氧化钨)works a bit like a battery. Tungsten oxide is clear when an electric charge is applied and dark when the charge is removed, that is, when the amount of voltage(电压)is decreased, the window darkens until it's completely dark after all electricity is taken away. So applying a voltage determines whether the window looks clear or dark.
      6.One important feature that makes a smart window so smart is that it has a sort of "memory". All it takes is a small shock of voltage to turn the window from one state to the other. Then, it stays that way. Transitions take from 10 seconds to a few minutes, depending on the size of the window. The development of smart windows could mean that massive air conditioning systems may no longer need. "In the future," Granqvist says, "our buildings may look different."
    文章(31~35)

    Which of the following values of windows is NOT mentioned?

    A.They let light in to brighten the house.
    B.They let light in to heat the house.
    C.They let us have visual contact with the surrounding world.
    D.They let us think about the outside world.

    答案:D
    解析:

  • 第19题:

    根据下列内容,回答211-215题。
    What should you think about in trying to find your career? You are probably better at some school subjects than others. These may show strengths that you can use in your work. A boy who is good at mathematics can use that in an engineering career. A girl who spells well and likes English may be good at office work. So it is important to know the subjects you do well in at school. On the other hand, you may not have any specially strong or weak subjects but your records show a gen- eral satisfactory standard. Although not all subjects can be used directly in a job, they may have indirect value. A knowledge of history is not required for most jobs but if history is one of your good subjects you will have learned to remember facts and details. This is an ability that can be useful in many jobs.
    Your school may have taught you skills, such as typing or technical drawing, which you canuse in your work. You may be good at metal work or cookery and look for a job where you can im-prove these skills.
    If you have had a part-time job on Saturdays or in the summer, think what you gained from it.If nothing else, you may have learned how to get to work on time, to follow instructions and to geton with older workers. You may have learned to give correct change in a shop, for example. Just asimportant, you may become interested in a particular industry or career you see from the inside ina part-time job. Facing your weak points is also part of knowing yourself. You may be all thumbswhen you handle tools; perhaps you are a poor speller or cannot add up a column of figures. It isbitter to face any weaknesses than to pretend they do not exist. Your school record, for instance,may not be too good, yet it is an important part of your background. You should not be apologeticabout it but instead recognize that you will have a chance of a fresh start at work.
    Which of the following best sums up the first paragraph?___________

    A.The importance of doing well at school
    B.Using school performance to help to choose a career
    C.The importance of being good at all subjects
    D.The indirect value of schoolwork

    答案:B
    解析:
    从第一段的第一、二句可以看出本段在讨论找工作和在学校的表现的关系,而全段都在说那些科目和那些工作,因此可以推断出答案是B。

  • 第20题:

    When you want to go shopping, decide how much money you can spend for new clothes.Think about the kind of clothes you really need.Then look for those clothes on sale (销售).
    There are labels (标签) inside all new clothes.The labels tell you how to take care of your clothes.The label for a shirt may tell you to wash it in warm water.A sweater label may tell you to wash by washing in cold water.The label on a coat may say "dry clean only." Washing may ruin(损坏) this coat.If you do as the directions (说明) say on the label ,you can keep your clothes looking their best.Many clothes today must be dry cleaned.Dry cleaning is expensive.When buying new clothes,check (核实) to see if they will need to be dry cleaned.You will save money if you buy clothes that can be washed.
    You can save money if you buy clothes that are well made.Well - made clothes last longer.
    They look good even after they have been washed many times.Clothes that cost more money are not always better made.They do not always fit (合身) better.Sometime less expensive clothes look and fit better than more expensive clothes.
    The first thing for you to do before you buy clothes is__________.

    A.to look for well-made clothes
    B.to see how much money you can pay
    C.to know how to wash them
    D.to read the labels inside them

    答案:B
    解析:
    此题为直接题。从文章第一段第一句可以看出答案选B。

  • 第21题:

    When you want to go shopping, decide how much money you can spend for new clothes.Think about the kind of clothes you really need.Then look for those clothes on sale (销售).
    There are labels (标签) inside all new clothes.The labels tell you how to take care of your clothes.The label for a shirt may tell you to wash it in warm water.A sweater label may tell you to wash by washing in cold water.The label on a coat may say "dry clean only." Washing may ruin(损坏) this coat.If you do as the directions (说明) say on the label ,you can keep your clothes looking their best.Many clothes today must be dry cleaned.Dry cleaning is expensive.When buying new clothes,check (核实) to see if they will need to be dry cleaned.You will save money if you buy clothes that can be washed.
    You can save money if you buy clothes that are well made.Well - made clothes last longer.
    They look good even after they have been washed many times.Clothes that cost more money are not always better made.They do not always fit (合身) better.Sometime less expensive clothes look and fit better than more expensive clothes.
    We learn from the reading that cheaper clothes__________.

    A.are always worse made
    B.must be dry cleaneD.
    C.can not be washeD.
    D.can sometimes fit you better

    答案:D
    解析:
    此题为推理题,文章中虽然没有直接信息,但从文章第二段及第三段很容易推断出A、B、C三项都是错误的。又从第三段最后一句话可以推断出答案选D。

  • 第22题:

    Research Is a State of Mind For many years there has been much misunderstanding as to just what research is. The popular conception seems to be that there is something mysterious about it, and before any research can be done it is necessary to have expensive scientific apparatus and large, elaborately equipped laboratories. Actually, this is not so. (6) It is a simple, organized way of trying to accomplish something you wish to do—so simple that anyone can do research anywhere at any time. First, you select the problem you would like to solve, then you list at least ten reasons why it has not been solved. (7) It takes just as much effort to solve a useless problem as a useful one. (8) After carefully—and I want to emphasize that word “carefully”—selecting the problem and the ten things between you and the solution, you then use the same procedure as in solving a crossword puzzle.(9)In the solution of the remaining obstacles you may need some simple apparatus, but the things you will probably need most are infinite patience and persistence. Few people realize the difficulties of doing any new thing. Maybe one of the reasons people are so easily discouraged is because of their education. During all our years at school we were examined two or three times a year. If we failed once, we were out. (10)If we are going to make progress, we must learn to fail intelligently so that we won't become discouraged at the 99.9 per cent failure. 8.()

    • A、 Make sure the game is worth the candle.
    • B、 That is a step in the right direction, but I don't believe it is enough.
    • C、 You take the easy obstacles first and by a process of elimination you eventually arrive at the one or two major ones.
    • D、 But in selecting the problem, you need to be sure to analyze it carefully to see that it is worth the effort.
    • E、 Research isn't a physical thing at all; it's a state of mind.
    • F、 By contrast, all research work is 99. 9 per cent failure and, if we succeed once, we are in.

    正确答案:A

  • 第23题:

    单选题
    Research Is a State of Mind For many years there has been much misunderstanding as to just what research is. The popular conception seems to be that there is something mysterious about it, and before any research can be done it is necessary to have expensive scientific apparatus and large, elaborately equipped laboratories. Actually, this is not so. (6) It is a simple, organized way of trying to accomplish something you wish to do—so simple that anyone can do research anywhere at any time. First, you select the problem you would like to solve, then you list at least ten reasons why it has not been solved. (7) It takes just as much effort to solve a useless problem as a useful one. (8) After carefully—and I want to emphasize that word “carefully”—selecting the problem and the ten things between you and the solution, you then use the same procedure as in solving a crossword puzzle.(9)In the solution of the remaining obstacles you may need some simple apparatus, but the things you will probably need most are infinite patience and persistence. Few people realize the difficulties of doing any new thing. Maybe one of the reasons people are so easily discouraged is because of their education. During all our years at school we were examined two or three times a year. If we failed once, we were out. (10)If we are going to make progress, we must learn to fail intelligently so that we won't become discouraged at the 99.9 per cent failure. 8.()
    A

     Make sure the game is worth the candle.

    B

     That is a step in the right direction, but I don't believe it is enough.

    C

     You take the easy obstacles first and by a process of elimination you eventually arrive at the one or two major ones.

    D

     But in selecting the problem, you need to be sure to analyze it carefully to see that it is worth the effort.

    E

     Research isn't a physical thing at all; it's a state of mind.

    F

     By contrast, all research work is 99. 9 per cent failure and, if we succeed once, we are in.


    正确答案: A
    解析: 空格处需填入的句子是对本段内容的进一步概括.A项意为“要确保这个事情值得一做”。答案为A。