新Prep CR2-100 求助(GWD变形)

ezailshi

    

 

    

100.

    

 

    

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

    

 

正确答案是B。

第一次做的时候没有选出答案，觉得选项都不能很有效的evaluate argument。

    

请大家看看我的推理思路是否有问题，总觉得很别扭。

    

 

    

因为other species不会携带那种bacterium，所以增加other species的数量，deer ticks被感染的数量就有可能减少。

    

 

    

B选项里，如果deer tick的数量目前受其生长初期进食的动物数量限制，那增加other species的数量，就会导致deer
tick数量的增加，从而更多的deer tick以other species为食，因此受感染的数量减少，support结论；反之如果不受限制，既使增加other species的数量，deer tick不一定会增多，受感染的deer tick数量也不一定会减少，weaken结论。

    

 

ezailshi

怎么发贴时总会出现那一大段乱码？

sausau

deer tick的幼虫只有在feed on 白腿鼠的时候才会感染上细菌。吃其他种类并不带来这种细菌。文中说，要是其他种类多了，deer tick带菌就会减少。

b说：
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    “ticks的数量是受限于幼虫时期的tick能获得食物来源。”
如果否定，那么就是、无论其他种类多多少少，deer tick的数量都不会变，说明过多的其他种类并不能转移幼虫的吸取对象，人家就喜欢在老鼠身上。。
如果肯定。就是，如果其他种类多了，那么在其他种类上寄生的幼虫数就增多，相对再老鼠身上的虫就少了。

你说得对

sandywood

这道题看不懂，我晕极了。哪位NN能讲得详细一点？C 怎么不对呢？

Cherliuiking

B是个whether形式，有yes or no两种回答
yes的话，说明现在吃哪种老鼠也是迫不得已，因为食物少，增加食物，就能减少吃到老鼠的机会
NO的话，就说明可能是就是喜欢吃老鼠啊，就算增加食物，他们也不倾向于选择其他食物
C和本题无关啊，为啥要控制deer的数量呢，要控制的是deer少吃那种老鼠

xulinran

顶四楼！我想了半天~~最后和四楼想的一样~~~我觉得这差不多是一个很合理的解释了