成人英语三级考试真题及答案部分

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Directions: There are three passages in this part. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You should decide on the best choice and blacken the corresponding letter on the Answer Sheet。

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 a nd 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 V olkow 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。

V olkow 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 bu the World Health Organization did not offer a clear answer to this. V olkow’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。

2. Doctor V olkow was astonished because ______。

A. her research has shed light on her understanding of cell phone

B. she found that cell phone exposure is harmful to human brain

C. she found that using a cell phone for about 50 minutes could influence or change brain activity

D. human brain is not responsive to electromagnetic radiation

3. According to the passage, cell phones were launched _______。

A. in the late 1970s

B. between 1980 and 1985

B. in the late 1980s D. in the early 1990s

4. What does the word “that” stand for in the second paragraph?

A. Brain activity。

B. Her research findings。

C. The fact that cell phone use may cause cancer。

D. Her research progress。

5. Which of the following is an appropriate title for this passage?

A. Cell Phone Radiation: Is It Harmful?

B. Cell Phone Radiati0n: Is It Useful?

C. Cell Phone Radiation: Is It Healthy?

D. Cell Phone Radiation: Is It Weak?

Passage 2

Questions 6 to 10 are based on the following passage:

Human beings have always had an ability to attend to several things at once. (78) Nor is electronic multitasking entirely new: We’ve been driving while listening to car radios since they became popular in the 1930s. but there is no doubt that multitasking has reached a kind of warp speed in the era of Web-enabled computers, when it has become routine to conduct several IM(及时通讯)conversations, watch TV and use the computer all at once。

But what’s the impact of this media consumption? And how are these multitasking devices changing how kids learn, reason and communicate with one another ?Social scientists and educators are just beginning to deal with these questions, but the

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