题目内容：

D

Are some people born clever, and others born stupid? Or is intelligence developed by our environment and experience? Strangely enough, the answer to these questions is yes. To some extent, person’s intelligence is fixed at birth, whether or not he reaches those limits will depend on his environment. This view, now held by most experts, can be supported in a number of ways.

It is easy to show that intelligence is to some extent something we are born with. The closer the blood relationship between two people, the closer they are likely to be in intelligence. Thus if we take two unrelated people at random(随意地) from the population, it is likely that their degree of intelligence will be completely different. If, on the other hand, we take two identical twins they will very likely be as intelligent as each other. Relations like brothers and sisters, parents and children, usually have similar intelligence, and this clearly suggests that intelligence depends on birth.

Imagine now that we take two identical twins and put them in different environments. We might send one, for example, to a university and the other to a factory where the work is  boring. We should soon find differences in intelligence developing, and this indicates that environment as well as birth plays a part. This conclusion is also suggested by the fact that people who live in close contact with each other, but who are not related at all are likely to have similar degree of intelligence.

68. The writer is in favor of the view that man’s intelligence is given to him

A. at birth                          B. through education

C. both at birth and through education    D. neither at birth nor through education

69. If a child is born with low intelligence, he is unlikely to      

A. become a genius so long as he or she works hard enough

B. still become a genius if he should be given special education

C. go beyond his intelligence limits even in rich surroundings

D. never reaches his intelligence limits in his life

70. The example of the twins going to a university and to a factory separately shows

A. the importance of their intelligence      

B. the role of environment on intelligence

C. the importance of their positions        

D. the part that birth plays

71. What can be the best title for the text?

A. Surroundings                           B. Intelligence

C. Dependence on Environment              D. Effect of Education