The phrase "sheds light on" in Paragraph 4 probably means " " .

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• 1Gilbert Roberts was shocked because .

  A.so many people had participated in the experiment

  B.so many of the participants were dishonest

  C.the effects of the pictures of flowers and gazing eyes were so different

  D.the effects of eyes and other perceptual signals were so powerful

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• 2The experiment conducted in Newcastle University shows that .

  A.people enjoy free drinks more than paid ones

  B.most people are dishonest if nobody is watching

  C.people like pictures of flowers more than pictures of eyes

  D.people are more honest when watched by pictures of eyes

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• 3The last paragraph focuses on .

  A.the factors that influence the workforce structure

  B.the importance of workforce distribution to the economy

  C.the relationship between age distribution and economy

  D.the influence of population growth on the national economy

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• 4The size of the workforce declines when .

  A.many people reach the retiring age

  B.the birth rate falls rapidly

  C.the number of retirees exceeds that of new workers

  D.the death rate increases

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• 5It can be concluded from Paragraph 2 that .

  A.a population growth leads to a greater proportion of workforce

  B.a large population does not necessarily mean a high proportion of workforce

  C.the size of the aged determines the proportion of workforce

  D.the proportion of the very young determines the size of workforce

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• 6According to the passage, early humans .

  A.were less selfish than the present-day people

  B.were more co-operative in nature

  C.had lo be co-operative to survive

  D.had to behave better than the present-day people

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• 7Images of eyes could be put up in the following places EXCEPT .

  A.subway entrances

  B.supermarkets

  C.back streets

  D.hotel bedrooms

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