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

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• 1The 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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• 2Many 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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• 3According 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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• 4People 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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• 5What 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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• 6The 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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• 7To “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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• 8Sound 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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• 9To knowingly allow oneself to purse unhealthy habits is compared by Fried and Crapo to ________.

  A.improving the quality of one’s life

  B.limiting one’s personal health choice

  C.deliberately ending one’s life

  D.breaking the rules of social behavior

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• 10According to Fries and Crapo sound health choices should be based on ________.

  A.personal decisions

  B.society’s laws

  C.statistical evidence

  D.friends’ opinions

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