Question

8．There are two factors which determine an individual's intelligence．The first is the sort of brain he is born with．Human brains differ considerably，some being more capable than others．But no matter how good a brain he has to begin with，an individual will have a low order of intelligence unless he has opportunities to learn．So the second factor is what happens to the individual-the sort of environment in which he is reared（抚养）．If an individual is handicapped 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 individual's intelligence can be demonstrated by the case history of the identical twins，Peter and Mark．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，and they were placed in separate foster（寄养） homes．Peter was reared by parents of low intelligence in an isolated community with poor educational opportunities．Mark was reared in the home of well-to-do parents who had been to college．He was read to as a child，sent to good schools，and given every opportunity to be stimulated intellectually．This environmental difference continued until the twins were in their teens，when they were given tests to measure their intelligence．Mark's I．Q．was 125，twenty-five points higher than the average and forty points higher than his identical brother．Given equal opportunities，the twins，having identical brains，would have tested at roughly the same level．
65．According to the passage，the average I．Q．isB．
A.85               
B.100             
C.110                     
D.125
66．This passage suggests that individual's I．Q．D．
A．can be predicted at birth                    
B．is inherited from his parents
C．stays the same throughout his life           
D．can be increased by education
67．This passage can best be titledB．
A．Measuring Your Intelligence              
B．Intelligence and Environment
C．The Case of Peter and Mark               
D．The Introduction of the I．Q．Test．

Answer 1

分析 本文是一篇科教类阅读，有两个因素决定一个人的智力．第一个是出生时就有的智力，不同的人大脑大大不同，有些是比其他人更有能力．本文以此展开谈论，主要讲述了智力与后天环境的关系．

解答 65．答案：B．细节理解题：从最后一段的句子：Mark's I．Q．was 125，twenty-five points higher than the average 可知，平均智商是100．故选B．
66．答案：D．细节理解题：从第二段的句子：Mark was reared in the home of well-to-do parents who had been to college．He was read to as a child，sent to good schools，and given every opportunity to be stimulated intellectually．可知人的智商是可以通过教育提高的．故选D．
67．答案：B．主旨大意题：阅读全文，从每段的段首，可以看出这篇文章讲的是智力和环境的关系．故选B．

点评 本文是一篇科教类阅读，题目涉及多道细节理解题．主旨大意题．做题时学生应仔细阅读原文，把握文章主要内容，联系文章上下文内容并结合所给选项含义，从中选出正确答案，一定要做到有理有据，切忌胡乱猜测．