同等学力在线视频培训免费试听 http:/edu.21cn.com/kcnet1840/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 causedby many different things. There is no longer any question that all learning disabilities result fromdifferences 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 diedin 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 werenot 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 onlearning 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 brains electrical activity and made a map of the electrical signals.Frank Duffy experimented with this technique at Childrens Hospital Medical Center in Boston. Doctor Duffy found large differences in the brain activity of normal children and those with reading problems. The differences appeared throughout the brain. Doctor Duffysaid his research is evidence that reading disabilities involve damage to a wide area of the brain，not just the left side.1. 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 functionC. size and arrangement D. color and arrangement同等学力在线视频培训免费试听 http:/edu.21cn.com/kcnet1840/2. 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 brain cells.D. Learning disabilities may result from problems in the left side of the brain.3. All of the following statements are true EXCEPT that .A. many factors account for learning disorderB. a learning-disabled person shows no outward signsC. reading disabilities are a common problem that affects 10 percent of the populationD. the brain activity of learning-disabled children is different fromthat of normal children4. Doctor Duffy believed that .A. he found the exact cause of learning disabilitiesB. the problem of learning disabilities was not limited to the left side of the brainC. the problem of learning disabilities resulted from the left side of the brainD. the problem of learning disabilities did not lie in the left side of the brain5. According to the passage we can conclude that further researches should bemade .A. to investigate possible influences on brain development and organizationB. to study how children learn to read and write，and use numbersC. to help learning-disabled children to develop their intelligenceD. to explore how the left side of the brain functions in language learning答案解析：答案解析：1. 【正确答案】D【考点类型】细节判断【解析过程】科学家们发现，没有学习能力的人的大脑细胞和一个正常人的大脑细胞的不同在于 A. 结构和功能 B. 颜色和功能 C. 大小排序 D. 颜色和排序线索1：文章的第3段提到“These cells normally are white. In the learning-disabled person，however，these cells were gray.”同等学力在线视频培训免费试听 http:/edu.21cn.com/kcnet1840/线索2：文章的第3段提到“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.”通过线索1和线索2的理解，我们可以判断正确答案应该是选项 D.2. 【正确答案】A【考点类型】细节判断【解析过程】下面哪句话是文章没有提到的？A. 无学习能力可能是由于大脑不被人认知的部位造成的。B. 无学习能力可能是由于大脑许多部位受到伤害造成的。C. 无学习能力可能是由于脑细胞的不正常组织造成的。D. 无学习能力可能是由于大脑左侧的问题。线索1：文章的第7段提到“that reading disabilities involve damage to a wide area of the brain，not just the left side.”表明 B 在原文中明确提到。线索2：文章的第3段提到“. nerve cells were mixed together.”表明选项 C 在文章中出现。线索3：文章的第5段提到“Doctor Geschwind proposed that learning disabilities resulted mainly from problems in the left side of the brain.”表明选项 D 在原文中明确提到。只有选项 A 在原文中没有提到。3. 【正确答案】C【考点类型】细节排除【解析过程】下面哪句是不正确的？A. 许多因素导致了无学习能力。B. 一个没有学习能力的人不会向外展示信号。C. 无学习能力是一个常见的问题，影响全部人口的10%。D. 没有学习能力的孩子大脑的活动和正常孩子的大脑活动不同。线索：文章的第1段提到“They affect perhaps 10 percent of all children.”很清楚是占据了所有孩子的10%，所以选项 C 是错误答案。A 选项在原文的第2段“.and that they are caused