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

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• 1It 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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• 2According 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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• 3The author’s attitude towards the current situation in the exploitation of natural resources is ________.

  A.positive

  B.neutral

  C.suspicious

  D.critical

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• 4According to the passage what is the best for both parents and children、

  A.They should adjust themselves to sharing the family expenses.

  B.Children should leave their parents when they are grown-up.

  C.Adult children should visit their parents from time to time.

  D.Parents should support their adult children when they are in troubl

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• 5The word “hassles” in the passage (Line 3, Par

  A.3) probably means ________.A.agreements

  B.worries

  C.disadvantages

  D.quarrels

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• 6What 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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• 7People 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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• 8According 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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• 9Many 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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• 10The 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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