| 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 fromthat of normal children
4. Doctor Duffy believed that .
A. he found the exact cause of learning disabilities
B. the problem of learning disabilities was not limited to 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 did not lie in the left side of the brain
5. According to the passage we can conclude that further researches should bemade .
A. to investigate possible influences on brain development and organization
B. to study how children learn to read and write，and use numbers
C. to help learning-disabled children to develop their intelligence
D. to explore how the left side of the brain functions in language learning
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.”
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 |
