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

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• 1According 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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• 2The 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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• 3According 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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• 4The word “hassles” in the passage (Line 3, Par

  A.3) probably means ________.A.agreements

  B.worries

  C.disadvantages

  D.quarrels

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• 5One of the disadvantages of young adults returning to stay with their parents is that ________.

  A.there will inevitably be inconveniences in every day life

  B.most parents find it difficult to keep

  C.the young adults tend to be overprotected by their parents

  D.public opinion is against young adults staying with their parents

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