It is easy to show that intelligence is to some extent something we are born with.The closer the __7__

　　relationship between two people，the closer they are likely to be intelligent.Thus if we take two unrelated people at random from population，it is likely that their degree of intelligence will be completely __8__.If，on the other hand，we take two identical twins，they will very likely to be as

　　__9__ as each other.Relations like brothers and sisters，parents and children，usually have similar intelligence，and this __10__

　　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 __11__ where the work is boring.We would soon find differences in intelligence __12__，and this indicates that environment as well as

　　__13__ plays a part.This __14__ 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 __15__

　　degree of intelligence.

　　【语篇导读】　本文为议论文，第一段提出论点：一个人的智力程度是生来就确定好的，但能达到什么程度就由后天的环境所决定了；第二段论证智力取决于先天；第三段论证环境对人的智力开发的影响，并得出结论：环境与出生对人的智力都起作用。

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