单项选择题

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 isalso 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.

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

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