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[Critical Reasoning]
试题详情
题目：
Which of the following most logically completes the passage?
Using new detection techniques, researchers have found trace amounts of various medicinal substances in lakes and rivers. Taken in large quantities, these substances could have serious health effects, but they are present in quantities far too low to cause any physiological response in people who drink the water or bathe in it. Nevertheless, medical experts contend that eliminating these trace amounts from the water will have public health benefits, since_____.
Using new detection techniques, researchers have found trace amounts of various medicinal substances in lakes and rivers. Taken in large quantities, these substances could have serious health effects, but they are present in quantities far too low to cause any physiological response in people who drink the water or bathe in it. Nevertheless, medical experts contend that eliminating these trace amounts from the water will have public health benefits, since_____.
选项:
A、some of the medicinal substances found in lakes and rivers are harmless to humans even if taken in large quantities
B、some of the medicinal substances found in lakes and rivers can counteract possible harmful effects of other such substances found there
C、people who develop undesirable side effects when being treated with medicines that contain these substances generally have their treatment changed
D、most medicinal substances that reach lakes or rivers rapidly break down into harmless substances
E、disease-causing bacteria exposed to low concentrations of certain medicinal substances can become resistant to them
答案:
E
提问：
E选项的bacteria原文并未提到 所以感觉不相关,并且也没有提及bacteria与health的关系 所以觉得E选项并不严谨
解答：
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提问：
E选项的bacteria原文并未提到 所以感觉不相关,并且也没有提及bacteria与health的关系 所以觉得E选项并不严谨
解答：
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提问：
CR题，题目中说一些东西微量无害，但是专家仍认为要除去。那么since后面解释要除去的理由就应该与这些东西有关，且说明这些东西仍有什么不好的地方。根据表意方向和相关性排除了A、C、D。留下了B、E中，错选了B。请老师帮忙解答，谢谢。
解答：
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