Passage 4
Are some people born clever and other born stupid? Or is intelligence developed by our environment and our experience? Strangely enough, the answer to these questions is yes. 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 rich and varied surroundings. Thus the limits of a person's intelligence are 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 is, the closer they are likely to be in intelligence. Thus if we take two unrelated people at random 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 depend 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 would soon find differences in their 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.
If a child is born with low intelligence, he can ______.
本题是推理判断题。题干的意思是：如果一个孩子出生时是低智商，他能______。从文章第一段我们可以判断，人的智商除了与遗传有关，环境也能改变智商。所以选C项。通过丰富多样的环境来改变智商。
'If we take two unrelated people at random from the population' (Para. 2) means if we ______.
本题是词语理解题。题干的意思是：如果我们从人群中随意找两个毫无关系的人，意味着______。理解这句话的意思关键在于句中两个重要的单词“unrelated(无亲戚关系的)、random(任意的)”。所以选D项。
The example of the twins going to a university and to a factory separately shows ______.
本题是推理判断题。题干的意思是：文中的例子把双胞胎分别放在大学和工厂两个不同的环境生活，其结果说明了______。文中第三段为了说明环境对人的智商起着非常重要的作用，举了一个双胞胎的例子。所以选C项。
The writer is in favor of the view that man's intelligence is given to him ______.
本题是推理判断题。题干的意思是：作者赞同的观点是人的智商的形成是由______。通过文章第二段和第三段分别论证，我们知道作者赞成的观点是智商的形成靠遗传和环境。从两段的中心句“It is easy to show that intelligence is to some extent something we are born with. ”和“Imagine now that we take two identical twins and put them in different environments. ”可得知选B项。
The best title of this passage can be ______.
本题是主旨大意题。题干的意思是：最适合这篇文章的题目是______。通过对上一小题的解答我们可以判断文章讨论的中心问题是智商。所以选C项。