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 __________.


some of the medicinal substances found in lakes and rivers are harmless to humans even if taken in large quantities

some of the medicinal substances found in lakes and rivers can counteract possible harmful effects of other such substances found there

people who develop undesirable side effects when being treated with medicines that contain these substances generally have their treatment changed

most medicinal substances that reach lakes or rivers rapidly break down into harmless substances

disease-causing bacteria exposed to low concentrations of certain medicinal substances can become resistant to them

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情景：新的技术让研究员们发现湖水以及河水指那个含有许多药物成分。如果大量服用这些药物成分，则可能导致人们患病。但是，现在河水以及湖水中的这种成分含量极低，但是，专家依然认为除掉这些成分是有助于人体健康的。

答案预估：

直接解释为何“专家依然认为除掉这些成分是有助于人体健康”的即可。

选项分析：

A选项：就算大剂量摄入，有些在水中的微量元素也不会对人体造成伤害。无论大量的摄入是否会造成伤害，本选项都和结论中的除掉这些成分无关。

B选项：有些在水中的药学成分可以中和令一些水中的药学成分所带来的不健康的影响。本选项提及了水中的药学成分，但是与推理文段的结论无关。

C选项：当被含有水中具有的药学元素的药物治疗时，那些具有不良副作用的人都换了药。本选项和结论无关。

D选项：大部分到达河流和湖泊中的药学成分都会迅速分解成无害的成分。本选项提及了“药物成分”，但描述的是药物成分的原理，不能评估推理。

E选项： Correct. 治病细菌长期暴露在低浓度的药物成分下会令致病菌具有抗药性。本选项是“药物成分”的一个特殊特点，这个特点会导致我们无论水中含量多少，移除这些药物成分，都会有利于公共卫生。

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Prep2008E1-CR
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