GWD-29-Q37

Rabbits were introduced to Numa
                    Island in the nineteenth century.  Overgrazing by the enormous population of rabbits now menaces the island’s agriculture.  The government proposes to reduce the population by using a virus that has caused devastating epidemics in rabbit populations elsewhere.  There is, however, a chance that the virus will infect the bilby, an endangered native marsupial.  The government’s plan, therefore, may serve the interests of agriculture but will clearly increase the threat to native wildlife.

Which of the following, if true, most seriously weakens the argument?

A.    There is less chance that the virus will infect domestic animals on Numa than that it will infect bilbies.

B.     There are no species of animals on the island that prey on the rabbits.

C.     Overgrazing by rabbits endangers many of the plants on which bilbies feed.

D.    The virus that the government proposes to use has been successfully used elsewhere to control populations of rabbits.

E.     There is no alternative means of reducing the rabbit population that would involve no threat to the bilby.

答案是A，但我觉得很有问题。即使这个virus对除了bilbies以外的本地植物都没什么危害，但它危害了稀有的bilbies就是造成了环境危害嘛

我选的C，现在也觉得有点怪怪的，请大家指导一下

应该是C，意思是说“如果不用virus使得rabbit灭亡，那么rabbit同样也会吃掉bilby的食物，使得bilby无食物而死”，所以还不如用virus，因为virus只是可能使得bilby死翘翘。

我觉得c只是增强了题目的前提条件：必须要控制rabbits的数量，而对结论本身：government’s plan, therefore, may serve the interests of agriculture but will clearly increase the threat to native wildlife 没有任何削弱或增强的作用；

不过我觉得a 的demestic animals明显是个无关，也不对啊。困惑中...

作者的结论是: government's plan may serve the interests of agriculture but will clearly increase the threat to native wildlife.

because the verus will infect bilbes. 作者的结论是针对native wildlif. it increase the threat to native wildlife.  But bibes can not represent native wildlife as a whole.

A.    There is less chance that the virus will infect domestic animals on Numa than that it will infect bilbies

A 就是起了削弱作用

. 因为病毒只会影响bilbies, 很少影响domestic animals. 所以对整个native wildlife不构成危险.

好奇怪，为什么我的答案是C？GWD到底有几份答案哦？

up

  兔子伤害农业，政府用药杀兔子；但是这种药对b动物有害；因此，政府的计划虽然帮助了农业但威胁了b动物。――：兔子危害了b动物的食物。

答题是A 吗？

TN-24中给的是C。