So far no life has been found outside the earth, but while some scientists are actively searching for living things in outer space, others firmly believe there ______.


  1. A.
    mustn’t be
  2. B.
    may not be
  3. C.
    can’t be
  4. D.
    won’t be
C
這題考查情態(tài)動詞的用法:can’t be“不可能”句意是:到目前為止沒有發(fā)現(xiàn)生命在地球上,但有些科學(xué)家正在積極尋找生物在外層空間,別人相信不可能有。選C
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科目:高中英語 來源: 題型:閱讀理解

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Will the young Fitzsimons’s folding wheel make it into production? I haven’t the foggiest idea. But his inventiveness shows two things. First, people have been saying for more than a century that bike design has reached its limit, except for gradual advances. It’s as silly a concept now as it was 100 years ago: there’s plenty still to go for. Second, it is in the field of folding bikes that we are seeing the most interesting inventions. You can buy a folding bike for less than ??1,000 that can be knocked down so small that it can be carried on a plane — minus wheels, of course — as hand baggage.

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Andrew Ritchie, inventor of the Brompton folding bicycle, once said that perfect portable bike would be “l(fā)ike a magic carpet... You could fold it up and put it into your pocket or handbag". Then he paused: “But you'll always be limited by the size of the wheels. And so far no one has invented a folding wheel."
It was a rare --- indeed unique --- occasion when I was able to put Ritchie right. A 19th-century inventor, William Henry James Grout, did in fact design a folding wheel. His bike, predictably named the Grout Portable, had a frame(框架) that split into two and a larger wheel that could be separated into four pieces. All the bits fitted into Grout's Wonderful Bag, a leather case.
Grout's aim: to solve the problems of carrying a bike on a train. Now doesn't that sound familiar? Grout intended to find a way of making a bike small enough for train travel: his bike was a huge beast. And importantly, the design of early bicycles gave him an advantage: in Grout's day, tyres were solid, which made the business of splitting a wheel into four separate parts relatively simple. You couldn't do the same with a wheel fitted with a one-piece inflated tyre.
So, in a 21st-century context, is the idea of the folding wheel dead? It is not. A British design engineer, Duncan Fitzsimons , has developed a wheel that can be squashed(擠壓)into something like a slender ellipse(橢圓 ) . Throughout, the tyre remains inflated.
Will the young Fitzsimons's folding wheel make it into production? I haven’t the foggiest idea. But his inventiveness shows two things. First, people have been saying for more than a century that bike design has reached its limit, except for gradual advances. It’s as silly a concept now as it was 100 years ago: there's plenty still to go for. Second, it is in the field of folding bikes that we are seeing the most interesting inventions. You can buy a folding bike for less than £1,000 that can be knocked  down so small that can be carried on a plane -- minus wheels, of course --as hand baggage.
Folding wheels would make all manner of things possible. Have we yet got the magic carpet of Andrew Ritchie's imagination? No. But it's progress.
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C. could be put in a pocket.                  D. looked like a magic carpet
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C. were fitted with solid tyres.               D. were hard to carry on a train.
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A. kept the tyres as whole piece.                    B. was made into production soon.
C. left little room for improvement.                D. changed our views on bag design.
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