A、To check whether blind children can regain their sight. B、To find whether blind people have a better sense of sound. C、To see

admin2012-12-13  39

问题  
In some children who go blind, certain parts of the brain that normally control vision appear to switch jobs and focus instead on sound, a new study has found.
    The study, by researchers at the University of Montreal, involved 7 adults who could see and 12 adults who had lost their vision when they were children. Each participant sat in a room with 16 loudspeakers at different locations. The room was designed so that there were no echoes. During the experiment, the speakers irregularly produced sounds. Participants had to point to where the sounds were coming from. Meanwhile, the researchers monitored blood flow in the brains of the participants to see which brain structures were working during the task.
    The results showed that 5 of the blind participants were very good at pointing to where sounds were coming from. In these people, blood flow increased in the visual cortex — an area at the back of the right side of the brain. This part of the brain is usually associated with vision. The other 7 blind participants showed no increase in activity in the visual cortex. These people didn’t do very well at picking out where sounds were coming from. Now, the researchers are looking at whether these people have gained an enhanced sense of touch instead of sound to replace their lost vision. The scientists say that their study shows how adaptable parts of the brain can be.
Questions 32 to 35 are based on the passage you have just heard.
32. What is the purpose of the experiment described in the passage?
33. What were the participants of the experiment asked to do?
34. During the experiment, why was blood flow in the brains of the participants measured?
35. What can best summarize the main idea of the passage?

选项 A、To check whether blind children can regain their sight.
B、To find whether blind people have a better sense of sound.
C、To see whether the sense of touch is better among blind people.
D、To find whether blood flow in the brains of blind people is slower.

答案B

解析 选项均以To find/check/see whether开头以及选项中重复出现的blind people表明,本题可能考查某件与盲人有关的事的目的。短文开头提到,一项新的研究表明失明儿童那部分控制视力的大脑转而来控制听力,紧接着介绍了实验过程,由此可知,实验目的是为研究盲人听觉是否更为灵敏,故答案为[B]。
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