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标题: 1-12 有道题很困惑，不过已经解决了~~ [打印本页]

作者: srafcatt 时间: 2012-10-10 10:30
标题: 1-12 有道题很困惑，不过已经解决了~~
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.
Parasitic wasps use visual clues to calculate the size of a host egg.

本人选C，正确答案为A
以下选项是自己翻译的，可能有错：
C 谈的是wasp会通过经验来确认不同的寄主（不同大小的蛋）要下多少蛋
A 是说理论上可以通过wasp的下蛋行为确定寄主最小的蛋的大小
觉得还是C 对

作者: srafcatt 时间: 2012-10-20 14:02
答案来自sdcar2010，谢谢她啦~
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.

启示：conclusion类型的题必须是能从文中得出的客观结论。不许有任何主观猜想和臆断。

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