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北大05年同等学力申硕学位外语水平统考模拟试题(6)
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| 文章出处： 发布时间：2006-03-29 |
Passage Two
What makes teenagers moody and impulsive? The answer used to be raging hormones plus a dearth of (短缺) life experiences. But three years ago this simple equation was blown apart by evidence from brain scans of strange goings-on behind the teenage forehead.
Till then, scientists had thought the brain’s internal structure was fixed by the end of childhood. The new scans showed the brain’s frontal cortex（皮层）thickening just before puberty(青春期), then slowly shirinking back to normal during the teenage years. Suddenly, the erratic huffiness(发怒) seemed to make sense: the teenage brain was a work in progress, a house in the process of being rewired.
Now comes more evidence of neural turmoil. According to psychologists in California, the speed with which youngsters can read the emotional expressions on people’s faces dips suddenly at around the age of 11 or 12 and takes years to get back on track.
The latest study, like the brain scan research before it, is a welcome and necessary part of building up a picture of a typical teenage brain so that scientists can get a better handle on what might be happening in the mental illnesses that appear to be afflicting children and adolescents in ever greater numbers. But there are dangers.
Scientists still have no idea how to interpret the subtle changes seen in adolescent brain scans. Yet in the wrong hands, these findings could be used to justify hothousing, impulse control training and other dubious attempts to get the most out of malleable teenage brain cells. The science could also spark a new wave of moralising based on a perceived need to protect teenagers’evolving brain connections from evil or toxic influences.
Incredibly, some scientists have already suggested in the press that the brain scan evidence somehow proves that it is biologically bad for teenagers to play video games or lie on the couch watching MTV. A hundred years ago one well-known“expert”urged teenage boys to drink six to eight glasses of hot water a day to flush impure thoughts from their bodies. Have we really learned so little?
36. In the past it was thought that teenagers were moody and impulsive because of _______ .
A. their innocence and lack of ilfe experience
B. their raging hormones and lack of life experience
C. their radical attitudes towards life
D. the generation gap between teenagers and their parents
37. Form the passage we can learn that __________ .
A. the teenage brain is a kind of work in progress
B. the new brain scans support the conventional thought
C. the brain’s frontal cortex becomes bigger during the teenager years
D. at the age of 11 or 12 teenagers are unable to find out people’s true feelings
38. The latest study is very helpful in that __________.
A. it can take clearer pictures of teenagers’brains
B. scientists will meet with fewer dangers in their research work
C. it may help scientists understand better the mental illness in teenagers
D. it may enable teenagers to experience fewer dangers during teenager years
39. According to paragraph five, which of the following statements reflects the present medical reality?
A. It is biologically bad for teenagers to play games or lie on the couch watching MTV.
B. Teenager boys should drink six or eight glasses of hot water in the morning everyday.
C. Scientists should apply the findings of brain scans to practical use as soon as possible.
D. Scientists still don’t know how to explain the subtle changes seen in teenager brain scans.
40. The author’s attitude towards the findings of teenagers’ brain scans can be concluded as _________ .
A. cautious
B. positive
C. prejudiced
D. neutral
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