The brain waves are the slowest during ____.

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• 1Stage 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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• 2The 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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• 3This 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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• 4If 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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• 5In listening to a person, the important thing is ____.

  A.to notice his tone, his posture, and the look in his eye

  B.to listen to how he pronounces his words

  C.to check his words against his manner, his tone of voice, and his posture

  D.not to believe what he says

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• 6In the second paragraph the word “dart” means ____.

  A.glare

  B.move rapidly or suddenly

  C.stop moving

  D.gaze

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• 7One 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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• 8Lens 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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• 9The 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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• 10After 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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