In the second paragraph the word “dart” means ____.

试卷相关题目

• 1The brain waves are the slowest during ____.

  A.stage 1

  B.stage 2 and stage 3

  C.stage 4

  D.REM sleep

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• 2Stage 4 sleep lasts ____.

  A.about 80 minutes

  B.about 4060 minutes

  C.about 30 munutes

  D.about 2040 minutes

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• 3The stages of sleep take on ____.

  A.an irregular aspect.

  B.a regular aspect

  C.a punctual aspect

  D.a similar aspect

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• 4This passage tries to tell you how to ____.

  A.avoid mistakes about both money and people

  B.say things elegantly

  C.avoid mistakes in understanding what people tell you

  D.keep people friendly without trusting them

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• 5If you followed the advice of the writer, you would ____.

  A.weigh carefully what people say to determine their real meaning

  B.get along well with people

  C.trust what other people say

  D.have no doubts about our friends

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• 6One of the features of REM sleep is that ____.

  A.there are large slow waves, though rapid for the first few minutes

  B.you have the deepest sleep

  C.there are no brain waves

  D.the brain waves are a little fast and the brain becomes a littleactive

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• 7Lens design and chess playing are similar in that ____.

  A.the final goal and the means by which it can be reached are known

  B.perfect solutions to a problem can be found

  C.any one decision at any point along the way to the goal can bringnumerous possible results

  D.both A and C

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• 8The final goal of designing a lens is ____.

  A.to trap the opponent's lenses

  B.to focus light with lenses

  C.to handmake lenses at low cost

  D.to reflect light by means of curved surfaces

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• 9After the passage the author will talk about ____.

  A.the principles of designing lenses

  B.techniques of making contact lenses

  C.the design of photographic lenses

  D.styles of lenses

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• 10Which of the following words cannot be used to describetoday's lenses、

  A.More delicate.

  B.Cheaper.

  C.Numerous.

  D.Unpopular.

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