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标题: prep 逻辑一道请大家帮忙看看 [打印本页]

作者: kelebonnie 时间: 2011-10-18 21:11
标题: prep 逻辑一道请大家帮忙看看
Prep 48. (34221-!-item-!-188;#058&007550)

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.
答案是A . 我的疑问是题目中是说Parasitic wasps下蛋的数量要依据host egg的大小来定，下多下少都得死。可是A选项的意思是说host egg的大小是由wasp的下蛋行为来决定，这不是是因果倒置吗？
我选的是C, 为什么C不对呢？

作者: sdcar2010 时间: 2011-10-18 21:31
What the message says is that the wasp can lay the EXACT needed/correct number of eggs for the next generation to survive. Thus choice A) is correct.

作者: kelebonnie 时间: 2011-10-18 21:58
这意思是说由wasp 下蛋的多少可以推断出smallest host 的大小，是因为wasp下蛋的量正好是host所能容纳的量。但是wasp本身来说是无法决定host大小的，用为host size 是先存在的。是这么理解吗？

作者: sdcar2010 时间: 2011-10-18 22:01
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.

作者: darlingchum 时间: 2011-10-19 01:18
C错的原因是全文没有提到experience

作者: Mengmoon 时间: 2011-11-4 16:57
“So you simply sit next to the host eggs and count···” is a vivid explanation!

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