2. 考研
  3. Learning disabilities are very common. They affect perhaps 10 percent of all children. Four times as many boys as girls have lea

Learning disabilities are very common. They affect perhaps 10 percent of all children. Four times as many boys as girls have lea

admin2005-06-26  103
问题     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 the 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 Duffy experimented with this technique at Children’s 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 Duffy said his research is evidence that reading disabilities involve damage to a wide area of the brain, not just the left side.
According to the passage we can conclude that further researches should be made______.
选项 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A
解析 综观全文，文章从一开始就提到了无学习能力，它们普遍地影响了现在1／10的儿童。就这个问题，科学家们进行了一系列的研究，无学习能力是由许多种不同的原因导致的。但主要与大脑有关，有的研究人员通过实例证明它与脑细胞的颜色和组织结构有关。诺尔曼·盖茨维德医生指出，它们与大脑左半部分没有正常发育有关，弗兰克·达菲医生又指出不仅仅是大脑左半部分，还与大脑很大范围的损伤有关。可见我们应更深一步地去研究脑的发育和其他结构，才能有效地解决无学习能力这个问题。A项符合文章的意思，所以应该选A。
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