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

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

questionable assumption是指削弱主题的假设吧?

正确答案c中,nectar 鸟吃的速度不比seed鸟慢,nectar能量又高,因此nectar鸟花的时间就少,,这不正符合主题意思吗?

不懂啊!!请nn赐教~~~~~

questionable assumption 是指基于问题设立的假设，既是让你找出此逻辑的假设命题，所以应该选C，在同样额能量需要量下，用的获取能力时间越短，效率应越高