单选题
To some extent, our intelligence is given to us at birth, and no amount of special education can make a genius out of a child born with low intelligence. On the other hand, a child who lives in a boring environment will develop his intelligence less than one who lives in 27 and varied surroundings. Thus the limits of a person's intelligence are 28 at birth, but whether or not he reaches those limits will depend on his environment. This view, now held by most experts, can be 29 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 30 . Thus if we take two unrelated people at random (随意) from the population, it is likely that their degrees of intelligence will be 31 different. Relations, on the other hand, like brothers and sisters, parents and children, usually have similar intelligence, and this clearly suggests that intelligence 32 on birth. Imagine now that we take two 33 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 would soon find differences in intelligence 34 and this indicates that environment as well as birth plays a part. This 35 is also suggested by the fact that people who live in close 36 with each other, but who are not relations at all, are likely to have the similar degree of intelligence. A. development B. slightly C supported D. depends E. contact F. lively G. focuses H. conclusion I. examined J. rich K. ielligence L. fixed M. complely N. identical O. distance