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Lyme disease is caused by a bacterium transmitted to humans by deer ticks.Generally, deer ticks pick up the bacterium while in the larval stage by feeding on infected white-footed mice. However, certain other species on which the
larvae feed do not harbor the bacterium. If the population of these other species were increased, more of the larvae would be feeding on uninfected hosts, so the number of ticks acquiring the bacterium would likely decline.
Which of the following would it be most important to ascertain in evaluating the argument?
(A) Whether populations of the other species on which deer tick larvae feed are found only in areas also inhabited by white-footed mice(B) Whether the size of the deer tick population is currently limited by the availability of animals for the tick's larval stage to feed on
(C) Whether the infected deer tick population could be controlled by increasingthe number of animals that prey on white-footed mice
(D) Whether deer ticks that were not infected as larvae can become infected as adults by feeding on deer on which infected deer ticks have fed
(E) Whether the other species on which deer tick larvae feed harbor any otherbacteria that ticks transmit to humans
我是这样想的，题目中意思是如果增加了没有被感染的other species的数量，更多的幼虫会以没被感染的寄主为食，所以被感染的ticks数量将会下降
对于D项我是这样想的，如果回答Yes, 那D项意思就成了，一些未被感染的幼虫在成虫时期会被感染。所以即便题目说的增加other species可以使更多幼虫不被感染但也仅仅是幼虫没被感染啊，幼虫变成成虫后依然会被感染，所以不能推出最终的被感染的ticks数量会下降（因为ticks既包括幼虫也包括成虫），所以D项这样一来就削弱结论。这样想哪里不对了，恳请各位朋友帮忙解答一下，感谢感谢！！
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发表于 2018-8-29 14:12:25
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