文档介绍：北京地区成人本科学士学位英语统一考试
Part I prehension (30%)
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 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
ic fields caused by wireless phone signals。
Volkow said she was surprised that the weak ic 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. “Thi