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标题: 求助PREP-77 [打印本页]

作者: 关灵韶 时间: 2009-6-9 22:57
标题: 求助PREP-77
77．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，potions 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．
(C) Parasitic wasps learn from experience how many eggs to lay into the eggs of different host species．
(D) Failure to lay enough eggs would lead to the death of the developing wasp larvae more quickly than would laying too many eggs．
(E) Parasitic wasps use visual clues to calculate the size of a host egg．
A是答案请牛人帮忙 A是怎么得出来的？？

作者: xfi883 时间: 2009-6-10 01:22

原文大意：

因为——W在寄主中生蛋太多=W蛋死，生蛋太少=寄主死=W蛋死

所以——W可以精确控制生蛋数量，以适应寄主大小

此题的逻辑是：W得生蛋数量可以反映寄主大小，反过来，记住大小可以通过观察W生蛋数量得到。

此题的关键词：“寄主大小”和“生蛋数量”

因此，答案中有这两个关键词的为正确选项。

A的意思是：W可以寄生的寄主的大小，理论上能够通过W的生蛋行为决定。

作者: Jasonhere 时间: 2010-3-27 17:52
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