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发布时间：2006-07-01 08:12     点击：

34. From the passage we can see that _________ .

　　A. quarantine has a very, very long history in America

　　B. quarantine has been used several times in America to protect people from the soread of epidemics

　　C. when quarantine is carried out, human rights are infringed upon 

　　D. American citizens have the right to protect their rights at any time and under any cirumstances

35. From this passage, we can infer that_________ .

　　A. faced with the threat of deadly unknown diseases quarantine is an outdated weapon 

　　B. quarantine is not very effective as compared with some other stronger measures

　　C. just like other laws, quarantine can be abused for evil purposes

　　D. quarantine is a weapon to hatm others so as to benefit oneself

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.

 

36. In the past it was thought that teenagers were moody and impulsive because of _______ .

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