Pandas are rapidly disappearing from the wild. Therefore, in order to preserve t

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问题 Pandas are rapidly disappearing from the wild. Therefore, in order to preserve the species, existing pandas should be caplured and placed in zoos around the world. Which of the following statements, if true, casts most doubt on the conclusion drawn above?

选项 A、When in captivity, pandas typically produce more young than they do in their native habitat.
B、Newborn pandas in zoos are not likely to die from infectious diseases, whereas newborn pandas in the wild are likely to die from these diseases.
C、Sufficient quantities of bamboo, the panda’s only food, cannot be made available outside the panda’s native habitat.
D、Many zoos are eager to increase their stock of rare and exotic animals, but there are not enough pandas for all the zoos that want one.
E、Pandas in zoos have as many offspring that survive to adulthood as do pandas in the wild.

答案 C

解析本题推理为达到一个目的而提出一种解决方法，即为了保护熊猫，应把他们放到动物园里。反对大多反对A，即方法A不可行或无意义。(A)、(B)起到支持作用；(D)动物园的希望与为了保护熊猫而提出的方法无关；(E)无关选项，虽然动物园里与野生环境中的熊猫有相同数量的后代，但仅仅由数量并不能说明问题。例如野生环境中有50只熊猫，有10只存活，动物园中有500只熊猫，也有10只存活，虽然存活数量相同，但基数不一样，结论则大相径庭。如果熊猫惟一的食物竹子不能在天然栖息地之外得到，正如(C)所说，那么也就反对了上面所提出的方法：把这些熊猫放到动物园里。但有的读者根据常识认为，大熊猫作为国宝，如果用飞机把熊猫的天然栖息地的竹子运过去就行了，因此(C)不正确。这样是思维所犯的错误就是没有理解“if true原则”的含义，“if true原则”限定了(C)选项的本身意思不能受到质疑。请读者认真体会if true的意思。

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