2011年5月北京成人英语三级考试真题

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2011 年 05 月 07 日北京地区成人本科学士学位英语统一考

试

　　Part I! Reading Comprehension (30%)

　　Passage 1

　　Questions I to 5 are based on the following passage:

　　Spending 50 minutes with a cell phone close to your ear is enough to change

brain cell activity in the part of the brain closest to the antenna( 天线). But

whether that causes any harm is not clear, scientists at the National Institute

of Health said at a conference last month, adding that the study will not

likely settle concerns of! a link between cell phones and brain cancer. “What

we showed is glucose ( 葡萄糖 ) metabolism( 代谢 )(a sign of brain activity)

increases in the brain in people who were exposed to a cell phone in the area

closest to the antenna,” said Dr. Nora Volkow of the NIH, whose study was

published in the Journal of the American Medical Association. (76) The study

was meant to examine how the brain reacts to electromagnetic fields caused by

wireless phone signals。

　　Volkow said she was surprised that the weak electromagnetic radiation(电磁

辐射) from cell phones could affect brain activity, but she said the findings

do not shed any light on whether cell phones cause cancer. “This study does

not in any way indicate that. What the study does is to show the human brain is

sensitive to electromagnetic radiation from cell phone exposures。” Use of the

devices has increased dramatically since they were introduced in the early

1980s, with about 5 billion cell phones now in use worldwide。

　　Some studies have linked cell phone exposure to an increased risk of brain

cancers, but a large study by the World Health Organization did not offer a

clear answer to this. Volkow’s team studied 47 people who had their brain

examined while a cell phone was turned on for 50 minutes and another while the

phone was turned off. While there was no complete change in brain metabolism,

they found a 7 percent increase in brain metabolism in the region closest to

the cell phone antenna when the phone was on。

　　 (77)Experts said the results were interesting, but urged that they be

understood with great care. “ Although the biological significance, if any, of

increased glucose metabolism from too much cell phone exposure is unknown, the

results require further investigation,” Henry Lai of the University of

Washington in the U.S. and Dr. Lennart Hardell of University Hospital in

Sweden, wrote in an article in JAMA. “Much has to be done to further

investigate and understand these effects。” They wrote。

　　1.According to the passage, which of the following is TRUE?

　　A.Cell phone use is dangerous。

　　B.Cell phone use causes cancer。

　　C.The human brain is an electromagnetic field。

　　D.There are about 5 billion cell phone users in the world right now。

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摘要：

2011年05月07日北京地区成人本科学士学位英语统一考试　　PartI ReadingComprehension(30%)　　Passage1　　QuestionsIto5arebasedonth

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