55. What used to be the danger in being a man according to the first paragraph?

　　[A] A lack of mates.

　　[B] A fierce competition.

　　[C] A lower survival rate.

　　[D] A defective gene.

　　56. What does the example of India illustrate?

　　[A] Wealthy people tend to have fewer children than poor people.

　　[B] Natural selection hardly works among the rich and the poor.

　　[C] The middle class population is 80% smaller than that of the tribes.

　　[D] India is one of the countries with a very high birth rate.

　　57. The author argues that our bodies have stopped evolving because____ .

　　[A] life has been improved by technological advance

　　[B] the number of female babies has been declining

　　[C] our species has reached the highest stage of evolution

　　[D] the difference between wealth and poverty is disappearing

　　58.Which of the following would be the best title for the passage?

　　[A] Sex Ration Changes in Human Evolution

　　[B] Ways of Continuing Man’s Evolution

　　[C] The Evolutionary Future of Nature

　　[D] Human Evolution Going Nowhere

　　[第55题答案及题解页数] C 第页

　　[第56题答案及题解页数] B 第页

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