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.
51. 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 .
52. 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.
53 . 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
54. 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
55. According to the passage we can conclude that further researches should be made ________.
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
Questions 56 to 60 are based on the following passage.
Visual impairment(视觉障碍) carries with it a reduced or restricted ability to travel through one's physical and social environment until adequate orientation and mobility skills have been established. Because observational skills are more limited, self-control within the immediate surroundings is limited. The visually impaired person is less able to anticipate hazardous situations or obstacles to avoid.
Orientation refers to the mental map one has of one's surroundings and to the relationship between self and that environment. The mental map is best generated by moving through the environment and piecing together relationships, object by object, in an organized approach. With little or no visual feedback to reinforce this mental map, a visually impaired person must rely on memory for key landmarks and other clues. Landmarks and clues enable visually impaired persons to affirm their position in Space. |
