Many Americans believe that ________.

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• 1According to Dr. David, Americans ________.

  A.are ideally vigorous even under the pressure of life

  B.often neglect the consequences of sleep deficit

  C.do not know how to relax themselves properly

  D.can get by on 6.5 hours of sleep

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• 2People in the 18th and 19th centuries used to sleep about 9.5 hours a night because they had ________.

  A.no drive and ambition

  B.no electric lighting

  C.the best sleep habits

  D.nothing to do in the evening

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• 3What does the author imply by saying “living space... is figured... also in cubic volume above the earth” (Lines 7-8, Par

  A.3)、A.Our living space on the earth is getting smaller and smaller.

  B.Our living space should be measured in cubic volume.

  C.We need to take some measure to protect space.

  D.We must preserve good living conditions for both birds and animals.

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• 4To avoid correcting the mistake of our forefathers, the author suggests that ________.

  A.we plant more trees

  B.natural science be taught to everybody

  C.environmental education be directed toward everyone

  D.we return to nature

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• 5It can be inferred from the third paragraph that earlier generations didn’t realize ________.

  A.the interdependence of water, soil, and living things

  B.the importance of the proper use of land

  C.the harmfulness of soil destruction and river floods

  D.the value of the beauty of nature

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• 6The word “subjects” (Line 1, Par

  A.4) refers to ________.A.the performance tests used in the study of sleep deficit

  B.special branches of knowledge that are being studied

  C.people whose behavior or reactions are being studied

  D.the psychological consequences of sleep deficit

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• 7It can be concluded from the passage that one should sleep as many hours as is necessary to ________.

  A.improve one’s memory dramatically

  B.be considered dynamic by other people

  C.maintain one’s daily schedule

  D.feel energetic and perform adequately

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• 8The concept of personal choice concerning health is important because ________.

  A.personal health choices help cure most illness

  B.it helps raise the level of our medical knowledge

  C.it is essential to personal freedom in American society

  D.wrong decisions could lead to poor health

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• 9To “live a completely sedentary life-style” (Line 7, Par

  A.1) in the passage means ________.A.to “live an inactive life”

  B.to “live a decent life”

  C.to “live a life with complete freedom”

  D.to “live a life of vice”

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• 10Sound personal health choice is often difficult to make because ________.

  A.current medical knowledge is still insufficient

  B.there are many factors influencing our decisions

  C.few people are willing to trade the quality of life

  D.people are usually influenced by the behavior of their friends

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