There are two factors which determine an individual's intelligence. The first is the sort of brain he is born with. 1 But no matter how good a brain he has to begin with,an individual will have a low 题目和参考答案——青夏教育精英家教网—

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There are two factors which determine an individual's intelligence. The first is the sort of brain he is born with. 1 But no matter how good a brain he has to begin with,an individual will have a low level of intelligence unless he has opportunities to learn. 2 If an individual is disabled environmentally,it is likely that his brain will fail to develop and he will never attain the level of intelligence of which he is capable.

The importance of environment in determining an individuaFs intelligence can be demonstrated by the case history of the identical twins,Peter and Mark X. Being identical,the twins had identical brains at birth,and their growth processes were the same. When the twins were three months old,their parents died. 3 Peter was raised by parents of low intelligence in an isolated community with poor educational opportunities. 4 He was read to as a child,sent to good schools,and given every opportunity to be stimulated (刺激) intellectually. This environmental difference continued until the twins were in their late teens,when they were given tests to measure their intelligence. Mark's I. Q. was 125,twentyfive points higher than the average and fully forty points higher than his identical brother. 5

A. So the second factor is what happens to the individual.

B. Meanwhile,Mark was adopted by a poor foster home.

C. Then they were placed in separate foster homes (收养家庭) .

D. Human brains differ considerably,some being more capable than others.

E. Mark was raised in the home of well-to-do parents who had been to college.

F. Secondly,whether you are brought up in a city or a poor village is also significant.

G. Given equal opportunities,the twins would have tested at roughly the same level.

1. 2. 3. 4. 5.

本文是一篇说明文，主要介绍了决定人智商的两个因素一大脑和后天环境。

1. D 考查顺承关系。上文提到影响人智商的第一个因素是大脑，选项中只有D"人类大脑有很大差异，有一些比其他的更有能力"提到大脑，并且语意衔接很流畅。

2. A考査递进关系。上文提到的是第一个因素大脑，下文提到环境的影响，所以选A"第二因素是在个人身上发生的事情"。该题目的混淆选项是F,该选项只提到人的成长环境的富裕或贫穷方面，过于片面。

3. C考查因果关系。前句讲到Peter和Mark的父母过世了，下一句讲的是Peter被一对低智商的夫妇领养，所以C "他们被送到了不同的收养家庭"最合适。

4. E考查对比关系。前句讲到Peter被一对低智商的夫妇收养，并且他们社区很孤立，没有什么受教育的机会。后一句讲到他从小就有人读书给他听，被送去学校，并且被给予很多机会来促进智力的发展。此处的"他"显然指的不是Peter,而是Mark,所以E "Mark在一个父母受过大学教育并且家境宽裕的家庭长大" 起到了很好的衔接作用。

5. G该句是对该段的总结：如果给予相同的机会，这对双胞胎智商测试的水平应该是差不多的

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