题目内容
12．Some of us were born clever and some stupid．Intelligence is developed by our environment and our experience．Why？To some extent our intelligence is given to us at birth，and no amount of 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 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，the closer they are likely to be in intelligence．Thus if we take two unrelated people at random from population，it is likely that their degree of intelligence will be completely different．If，on the other hand，we take two identical twins，it will be very likely that they are as intelligent as each other．Relations like brothers and sisters，parents and children，usually have similar intelligence，and this clearly 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 factory where the work is boring．We would soon find differences in 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．
29．Which of these sentences best describes the writer's point in Paragraph 1？C
A．To some extent，intelligence is given at birth．
B．Intelligence is developed by the environment．
C．Intelligence is influenced both by birth and the environment．
D．Some people are born clever and others born stupid．
30．The underlined phrase"at random"meansA．
A．aimlessly
B．frequently
C．purposely
D．independently
31．The best title for this article would beB．
A．What Does Intelligence Mean？
B．On Intelligence
C．We Are Born with Intelligence
D．Environment Plays a Part in Developing Intelligence．
分析 文章以智商为中心，主要介绍了影响智商的两个因素：先天和环境
解答 29：C 段落大意题．由第一段中的Thus the limits of person's intelligence are fixed at birth，but whether or not he reaches those limits will depend on his environment可知，该段中心意思是人的智商在出生时就确定了．但是，环境决定了我们的智商是否可以发展到极限，故C选项正确
30：A 词义猜测题．purposely 故意地，有意地；rationally 合理地，理性地；aimlessly 无目的地；independently 独立地．由语境可知，当我们随意从人群中选出两个人来时，他们的智商水平有可能完全不同，故A选项正确．
31：B 主旨大意题．文章以智商为中心，主要介绍了影响智商的两个因素：先天和环境，故B选项正确．
点评 本文是一个科教类阅读理解，题目涉及多道细节理解题，做题时结合原文和题目有针对性的找出相关语句进行仔细分析，结合选项选出正确答案．推理判断题也是要在抓住关键句子的基础上合理的分析才能得出正确答案，切忌胡乱猜测，一定要做到有理有据．
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