标题: 一道GWD逻辑题 [打印本页] 作者: sherryuk 时间: 2012-12-17 10:23 标题: 一道GWD逻辑题 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 有两个版本 A C 个人倾向A 原文结论是这个virus 会使bilby 数量减少 问doubt 应该选 virus不能使bilby数量减少的选项吧 A 正好说 这个virus 更容易感染非本地的生物 即rabbit 应该正确