Q52 ( I chose E, why C is the correct key?)

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 that does the nectar-eating bird, since a given amount of nectar provideds more energy than does the same amount of seeds

The arguement 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 somethings 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 depends on factors such as the size of the bird, its nest-building habits and the climate of the region in which it lives

前提1：seed－eating和nectar－eating的鸟儿需要同样多的能量

前提2：nectar比seed提供更多的能量

结论：seed－eating的鸟儿要花比nectar－eating的鸟儿更长的时间来摄取同样的能量。

C说，鸟吃nectar的速度不比吃seed的速度慢。如果取非，就是鸟吃nectar的速度比吃seed的慢，则虽然鸟需要更多的seed，但它们吃得更快，所以seed－eating得鸟并不一定要花比nectar－eating得鸟更长的时间来摄取同样能量。所以C去非对文章结论有削弱作用，就是答案。

E有太多无关信息，属于out of scope。

“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。和C相反，所以c questionable。---- seanql  ”

觉得FEIFEI详解版的解释有误，C选项确实应该翻译成 鸟吃nectar的速度不比吃seed的速度慢---nectar鸟吃的速度至少快于seed鸟，这和C是一致的。

觉得FEIFEI详解版的解释有误，C选项确实应该翻译成 鸟吃nectar的速度不比吃seed的速度慢---nectar鸟吃的速度至少快于seed鸟，这和C是一致的。

但不理解C为什么是一个questionable assumption?

但不理解C为什么是一个questionable assumption?

Simply because the argument itself is questionable.

还是没理解这道题到底是让我们选一个最合适的assumption，还是要选一个有问题的assumption，即不能支持原文结论的assumption？

如果按楼上说的，这个assumption本身是questionable的，那么不就变成其它四个选项都能支持原文结论了吗？但是选项C明明就是在支持原文结论，所以真的有点被questionable assumption这个提法搞迷糊了……希望NN快来给我解疑啊！

thanks  a lot !!!!!!!!!!