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 __________.
本身逻辑思维就比较紊乱
最近在苦啃逻辑
今天做到95题,看答案分析看不懂,答案是E,觉得B也可以呀,可能自己太笨了
求各位同学指点迷津
好人一森平安~~~
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 __________.
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
in my view: B的意思是说有水里一些药性物质抵消了水里另外一些物质的毒作用,因此是无害的。 而最后的结论是消除这些trace amounts of medicinal substances 是有利于公众健康的,其实就是个加强题, B既然本身是无害的,那么怎么能加强呢? 相反地,E却很好的加强了,因为水里本来medicinal substances 的量就少(根据后一句说far too low to……),那么可能会导致致病菌的抗药性(根据E),那么人喝下去就会得病,如果消除trace amounts of substances, 那么致病菌就不会有抗药性,那么致病菌就有可能被消除?晕……怎么我也有点乱了,觉得E好像不是那么严谨呀!