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标题: og-175 [打印本页]

作者: valarie 时间: 2004-8-23 23:02
标题: og-175

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.
(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.

用排除法可以得到A。但为什么是A 不懂。。

作者: valarie 时间: 2004-8-24 09:25
up

作者: lawyer_1 时间: 2004-8-24 10:49
关键对原文第一句话的理解：wasps在不同大小的寄主蛋上产确定数量的的蛋。即一定大小的寄主蛋，wasps产在上面的蛋的数量是确定的。从这点上，我们理论上可以（could theoretically ）算出wasps单个蛋所需要的寄主蛋的大小，这个寄主蛋的大小就是wasps能产蛋在上面的最小寄主蛋的大小，因为不可能让WASPS产少于一个蛋在寄主蛋上面。所以理论上可以从WASPS的产蛋行为（即在某个一定大小的寄主蛋上产的蛋的数量）确定它所能寄生（蛋长大变成WASPS并寄生在寄主蛋上面）的最小寄主蛋的大小

作者: 双鱼游 时间: 2010-9-12 17:09
斑竹说的好绕啊，请问为啥不选C 啊

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