费费逻辑宝典---52题

52. Birds need so much food energy to maintain their body temperatures that some of them spend most of their time eating. But a comparison of a bird of a seed-eating species to a bird of a nectar-eating species that has the same overall energy requirement would surely show that the seed-eating bird spends more time eating than does the nectar-eating bird, since a given amount of nectar provides more energy than does the same amount of seeds
题目已经告知body temperature是energy requirement的一部分了，没有必要再对此疑问，这个是fact,逻辑题只讨论演绎过程，不对Fact。题目并且也已经告诉你energy requirement 也一样，也是一个fact, 所以可以排除 A D E

文章说需要的能量一样，但是吃种子的比吃N的花在吃上面的时间多，得出一个结论说N的单位能量高于种子的单位能量，这里有个假设，就是吃的时间多那么吃的也多。但是如果吃的时间多，但是吃的量一样多，这个结论就不成立了。简单画个图就是：

吃种子的时间较多－》种子的量较多－》所以单位能量较少　这是提干的推理过程；

C说吃种子的时间多，即便量都一样，鸟吃种子花费时间还是多。都是一斤，吃种子要１个小时，吃N只要３０分钟，那么这个中间过程就被否定掉了。

B无关。

C正好削弱，因为C说
The argument relies on which one of the following questionable assumptions

(A) Birds of different species do not generally have the same overall energy requirements as each other

(B) The nectar-eating bird does not sometimes also eat seeds

(C) The time it takes for the nectar-eating bird to eat a given amount of nectar is not longer than the time it takes the seed-eating bird to eat the same amount of seeds  

(D) The seed-eating bird does not have a lower body temperature than that of the nectar-eating bird

(E) The overall energy requirements of a given bird do not depend on factors such as the size of the bird, its nest-building habits; and the climate of the region in which it lives

答案选C.
Nectar鸟和seed鸟需要能量一样多，但nectar食物单个能量大，所以nectar鸟吃的数量少。结论：nectar鸟吃东西花的时间少。 使以上必然成立的条件（assumption)是nectar鸟一定吃的更快，不然还是有可能花的时间比seed鸟多。C就是类似于这个假设的,为何还是有疑问的假设?

it is questionable casue the assumption made in C might be wrong, though the assumption supports the argument.