According to Dr. David, Americans ________.

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• 1People 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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• 2What 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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• 3To 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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• 4It 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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• 5According to the author, the greatest mistake of our forefathers was that ________.

  A.they had no idea about scientific forestry

  B.they had little or no sense of environmental protection

  C.they were not aware of the significance of nature study

  D.they had no idea of how to make good use of raw materials

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• 6Many Americans believe that ________.

  A.sleep is the first thing that can be sacrificed when one is busy

  B.they need more sleep to cope with the complexities of everyday life

  C.to sleep is something one can do at any time of the day

  D.enough sleep promotes people’s drive and ambition

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• 7The 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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• 8It 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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• 9The 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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• 10To “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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