补全短文（第46～50题，每题2分，共10分）
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Are some people born clever and others born stupid? Or is intelligence developed by our environment and our experiences? Strangely enough, the answer to both these question is yes. ___46___. On the other hand, a child who lives in a boring environment will develop his intelligence less than one who lives in rich and varied surroundings. Thus the limits of a person’s intelligence are fixed at birth. ___47___. 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. ___48___. Thus if we take two unrelated people at random from the population, it is likely that their degrees of intelligence will completely different. ___49___. Relations like brothers and sisters, parents and children usually have similar intelligence. ___50___.
A. The closer the blood relationship between two people, the closer they are likely to be intelligent.
B. If on the other hand we take two identical twins, they will very likely be as intelligent as each other.
C. To some extent, our intelligence is given us so far and no amount of special education can make a genius out of a child born with low intelligence.
D. This clearly suggests that intelligence depends on birth.
E. But whether or not he reaches those limits will depend on his environment.
F. Intelligence depends on birth.
