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  3. Do strong electric currents, by means of the electromagnetic fields that accompany them, cause cancer in people who live and wor

Do strong electric currents, by means of the electromagnetic fields that accompany them, cause cancer in people who live and wor

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问题 Do strong electric currents, by means of the electromagnetic fields that accompany them, cause cancer in people who live and work nearby? Telephone line workers, who work near such currents every day, can provide a test case. They show elevated levels of brain cancer; therefore, the hypothesis of electromagnetic causation is supported. Which of the following, if true, most seriously weakens the argument?
选项 A、Burying power lines and other measures to protect the public from such electromagnetic fields would be prohibitively expensive.
B、Telephone line workers are exposed to levels of chemical solvents high enough to cause brain cancer.
C、High exposure to strong electromagnetic fields is correlated with a slightly higher-than-normal incidence of childhood leukemia, which is a form of cancer.
D、Public health officials who found that a group of different illnesses in people living near a power substation could not reliably be attributed to its electromagnetic field were accused of covering up the facts.
E、Telephone line workers, like most people have electrical appliances at home, and most electrical appliances, when turned on, are surrounded by an electromagnetic field of some measurable level.
答案B
解析 本题属于典型的“B，A”类型的反对。反对思路是“除了A之外有其他原因导致B”。(B)说明电话线工人接触了过量的化学溶液，而这足以导致脑癌，表明“过量的化学溶液导致脑癌”，很好地用“有他因”来反对上面的结论。(A)只是提供了一种不可行的解决方案，不能起到反对的作用；(C)谈的是另外一个对象“白血症”与“脑癌”无关；(D)什么也说明不了；(E)起到了支持作用。
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