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. Birds need so much food energy tomaintain their body temperatures that some of them spend most of their time eating. But a comparisonof a bird of a seed-eating species to a bird of a nectar- eating species that has the same overallenergy requirement would surely show that the seed- eating bird spends more time eating thandoes the nectar-eating bird, since a given amount of nectar provides more energy than does thesame amount of seeds Theargument relies on which one of the following questionable assumptions (A) Birds of different species do notgenerally have the same overall energy requirements as each other (B) The nectar-eating bird does notsometimes also eat seeds (C) The time it takes for the nectar-eating bird to eata given amount of nectar is not longer than the time it takes the seed-eatingbird to eat the same amount of seeds (D) The seed-eating bird does not have alower body temperature than that of the nectar-eatingbird (E) The overall energy requirements of agiven bird do not depend on factors such as the size of the bird, its nest-building habits; and the climate of the region inwhich it lives
答案似乎是无争议是C, 但是我觉得还是不太明白。
因为题目说的是“因为 given amount of nectar provides more energy than does the same amount of seeds（等量的N提供的能量大于等量的S），所以the seed-eating bird spends more time eating than does the nectar-eating bird(SB花在吃的上面的时间要多于NB花在吃的上）。
那么成立的前提确实是”SB吃饭的速度不比NB慢，也就是NB吃饭花的时间不比SB短， 可是选项C说的是NB画得时间不比NB长，这不反而削弱了吗？
请大牛解答啊！拜托了！ | 
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发表于 2014-2-4 22:32:55
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