考前两天，问一道prep题 N.100

LUCIE_SIMON

100.
    (30745-!-item-!-188;#058&005748)      (T-9-Q28. ��ɽ-7-13 , different type)

 

 

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 increasing the 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 other bacteria that ticks transmit to humans

答案是B，我选了D，不是很明白，求NN答疑解惑

答案是B，我选了D，不是很明白，求NN答疑解惑

[此贴子已经被作者于2009-5-29 21:46:36编辑过]

LUCIE_SIMON

顶，求NN帮帮忙啊……55555555555

LUCIE_SIMON

流泪顶

LUCIE_SIMON

考前最后一天了，哭死……