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标题: [求助] 再问 og 175 谢谢！：） [打印本页]

作者: juliet01192000 时间: 2006-3-30 22:16
标题: [求助] 再问 og 175 谢谢！：）
175. Parasitic wasps lay their eggs directly into the eggs of various host insects in exactly the right numbers for any suitable size of host egg. If they laid too many eggs in a host egg, the developing wasp larvae would compete with each other to the death for nutrients and space. If too few eggs were laid, portions of the host egg would decay, killing the wasp larvae.

Which of the following conclusions can properly be drawn from the information above?

(A) The size of the smallest host egg that a wasp could theoretically parasitize can be determined from the wasp’s egg-laying behavior.

(B) Host insects lack any effective defenses against the form of predation practiced by parasitic wasps.

(D) Failure to lay enough eggs would lead to the death of the developing wasp larvae more quickly than would laying too many eggs. A

(E) Parasitic wasps use visual clues to calculate the size of a host egg.

175.

Comparing two host eggs in which parasitic wasps have laid different numbers of eggs, it is theoretically possible laid different numbers of eggs, it is theoretically possible to determine what size of host egg would be required for a single wasp egg. This would be the smallest egg the wasp could parasitized, so A is the best answer.

知道为什么选A,但是我觉得og的解释有问题。

因为我们首先知道host egg的size大小，然后通过the wasp’s egg-laying behavior知道一共下了多少蛋，用size/蛋的数量=The size of the smallest host egg that a wasp could theoretically parasitize

通过比较两个host egg? 一个就够了呀。

不解，大家帮忙看看，谢谢！：）

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