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  3. A study of people who used cell phones for an average of less than three years found no evidence the devices cause brain cancer.

A study of people who used cell phones for an average of less than three years found no evidence the devices cause brain cancer.

admin2010-03-26  35
问题     A study of people who used cell phones for an average of less than three years found no evidence the devices cause brain cancer. The research didn’t, however, answer the question of whether longer-term use is dangerous. The study of 891 people did find a slightly increased risk for a rare type of brain cancer, but the researchers said it was not statistically significant. While they acknowledged longer-term studies are needed, the researchers said the overall results should reassure the more than 86 million cell-phone users nationwide. "We feel confident that the results reflect that cell phones don’t seem to cause brain cancer," said epidemiologist Joshua Muscat, a scientist at the American Health Foundation who helped lead the study.
    Publication of Muscat’s research prompted the New England Journal of Medicine to release a study showing similar results. The study, led by National Cancer Institute researchers, looked at 782 brain cancer patients and 799 people without cancer. Maximum cell-phone use was at least an hour per day for five or more years, and no brain-cancer link was found even at that level.
    Unlike regular telephones, handheld cell phones contain an antenna inside the receiver, which puts the user’s brain close to the electromagnetic radio waves the antenna emits. Since cell phones were introduced in the United States in 1984, conflicting data have emerged from safety studies on animals and humans.
     The Food and Drag Administration (FAD) has said there is no evidence that the phones are unsafe, but it has joined with wireless industry in sponsoring research on the devices. Some cell-phone makers have also started disclosing their products’ radiation levels.
    Another study involved phone-use questionnaires given to 469 men and women aged 18 to 80 with brain cancer and a 422-member cancer-free control group. Cell-phones use was slightly more common among the cancer-free participants, though average cell-phone use for both groups was under three hours monthly for less than three years.
    The amount and duration of cell-phone use were not related to an increase brain cancer risk except for a type of neuron-cell tumor called neuroepitheliomatous cancer. Of the 35 patients with this rare tumor, 14 percent used cell-phones.
The author’s view in this passage is that ______.
选项 A、cell phones and cancer are not linked
B、people shouldn’t use cell-phones in a long-term
C、using cell-phones is one cause for cancer
D、cell-phones are not harmful
答案A
解析 主旨大意题。整篇文章始终都在强调移动电话引发癌症的几率少之又少，还引用了许多科学研究来证明。所以A“移动电话和痛症没有关系”是最佳的选项。B“不要使用移动电话”太绝对，所以不选：至于C“使用移动电话是引发癌症的一个原因”，它是和整篇文章相悖离的：而D“移动电话是没有害处的”表述，文中并没有提到，所以不选。
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