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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?

正确答案: A

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一道PREP的破解逻辑 这种题型摸不着头脑 求帮助 谢谢

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发表于 2011-7-26 10:11:18 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
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.
答案:A
我知道其他4个答案都无根据,那为什么可以推出A,做类似这样子的题目有没有什么依据啊???
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沙发
发表于 2011-7-26 10:24:07 | 只看该作者
This is a must be true type of question.

A is the correct answer. The stimulus says "arasitic 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 so, the wasp can adjust the number of eggs laid according to the size of the host egg.  So you simply sit next to the host eggs and count how many eggs the parasitic wasp lays. Make a chart and compare. The host eggs receiving the lowest amount of parasit eggs would be the smallest host egg.
板凳
发表于 2012-4-8 19:52:58 | 只看该作者
这题就是考阅读啊!看完SDCAR NN的解释才发现自己一开始没太明白题干的conclusion!
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