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点击查看：2013年职称英语理工类B级阅读理解练习题及答案汇总
Learning Disabilities
Learning disabilities are very common. They affect perhaps 10 percent of all children. Four times as many boys as girls have learning disabilities.
Since about 1970, new research has helped brain scientists understand these problems better. Scientists now know there are many different kinds of learning disabilities and that they are caused by many different things. There is no longer any question that all learning disabilities result from differences in the way the brain is organized.
You cannot look at a child and tell if he or she has a learning disability. There is no outward sign of the disorder. So some researchers began looking at the brain itself to learn what might be wrong.
In one study, researchers examined the brain of a learning-disabled person who had died in an accident. They found two unusual things. One involved cells in the left side of the brain, which control language. These cells normally are white. In the learning disabled person, however, these cells were gray. The researchers also found that many of the nerve cells were not in a line the way they should have been. The nerve cells were mixed together.
The study was carried out under the guidance of Norman Geschwind, an early expert on learning disabilities. Doctor Geschwind proposed that learning disabilities resulted mainly from problems in the left side of the brain. He believed this side of the brain failed to develop normally. Probably, he said, nerve cells there did not connect as they should. So the brain was like an electrical device in which the wires were crossed.
Other researchers did not examine brain tissue. Instead, they measured the brain's electrical activity and made a map of the electrical signals.
Frank Dully experimented with this technique at Children's Hospital Medical Center in Boston. Doctor Dully found large differences in the brain activity of normal children and those with reading problems. The differences appeared throughout the brain. Doctor Duffy said his research is evidence that disabilities involve damage to a wide area of the brain, not just the left side.
41 Which of the following is NOT mentioned in the passage? _________.
A Learning disabilities may result from the unknown area of the brain.
B Learning disabilities may result from damage to a wide area of the brain.
C Learning disabilities may result from abnormal organization of the brain cells.
D Learning disabilities may result from problems in the left side of the brain.
42 Scientists found that the brain cells of a learning-disabled person differ from those of a normal person in _________.
A structure and function
B color and function
C size and arrangement
D color and arrangement
43 All of the following statements are TRUE except that _________.
A many factors account for learning disorder
B a learning-disabled person shows no outward signs
C reading disabilities are a common problem that affects 10 percent of the population
D the brain activity of learning-disabled children is different from that of normal children
44 Doctor Duffy believed that __________.
A he found the exact cause of learning disabilities
B the problem of learning disabilities did not lie in the left side of the brain
C the problem of learning disabilities resulted from the left side of the brain
D the problem of learning disabilities was not limited to the left side of the brain
45 According to the passage we can conclude that further researches should be made __________.
A to help learning-disabled children to develop their intelligence
B to study how children learn to read and write, and use numbers
C to investigate possible influences on brain development and organization
D to explore how the left side of the brain functions in language learning
参考答案：
41 A文章中没有提及下列中的哪一项?A学习上的缺陷可能是大脑的某个未知的区域造成的;B学习上的缺陷可能是对整个大脑的损伤造成的;C学习上的缺陷可能是由脑细胞的不正常排列造成的;D学习上的缺陷可能是大脑左半球的问题造成的。
42 D科学家发现学习上有缺陷的人的脑细胞与正常人的不同在于：A结构和功能;B颜色和功能;C大小和排列方式;D颜色和排列方式。
43 C下列陈述中不正确的是哪一项?A造成学习缺陷的因素很多;B学习有缺陷的人表面没有明显标志;C阅读缺陷是一个非常普遍的问题，有这方面问题的人占总人口的10%;D学习有缺陷的儿童与正常儿童的大脑活动方式不同。
44 D Duffy医生相信：A他发现了造成学习缺陷的确切原因;B学习缺陷不是大脑左半球的问题造成的;C学习缺陷是由大脑左半球的问题造成的;D学习缺陷不仅仅是由大脑左半球的问题造成的。
45 C根据文章可以推断出以后的研究应主要致力于：A帮助有学习缺陷的儿童发展智力;B研究儿童是如何学习阅读、写作和使用数字的;C找出可能影响大脑发育及其结构的原因;D找出大脑左半球在语言学习过程中的功能。
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