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标题: 没有答案的CR题？题号PREP07 48. (34221-!-item-!-188;#058&007550) [打印本页]

作者: u43 时间: 2012-9-3 02:43
标题: 没有答案的CR题？题号PREP07 48. (34221-!-item-!-188;#058&007550)
PREP07 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.

答案选A。
明白BCDE的错处，但不明白为什么A对，请NN们指点迷津，就此谢过！
B 原文没有涉及
C PS可以决定好how many eggs to lay, 但原文没说是learn from experience
D more quickly--原文没有比较哪个快，无从得知
E 原文没说PS是如何计算下多少个卵。
选A的解释是：因为不同的HI有不同的最适SIZE，所以判别不同HI的不同最适size的最佳方式就是通过看W的放卵行为来得到那个平衡值。注意！！这里不是从W的角度来得知最适size，而是从旁观者得研究角度来看的！

我的理解是：固然PS能根据HI卵的size下不同size的寄生卵，但怎么知道ps下了多少个卵？要知道size总得要知道总大小和个数吧？
请问各位是如何理解的？

作者: 楚小月purple 时间: 2012-9-5 21:33
不是NN，说下自己的理解，轻拍~

A选项：理论上，最小的host egg是从the wasp's egg-laying bahavior看出来的。

LZ的理解是不是有点钻牛角尖了……？

作者: shouzhudaiyang 时间: 2014-7-14 16:58
我觉得这道题很奇怪，首先A简化一下，可以理解为：host egg 的size能通过w的产卵行为推测出来（因为w的产卵多少跟size是有关的）。但我没搞懂A中那个the smallest host egg是什么意思。

求解答

作者: alisakwong 时间: 2014-8-25 20:13
C 下多了会自相残杀，下少了会被吃掉，难道这个不是经验得出来的吗？想不通好痛苦

作者: vampire_lily 时间: 2014-8-31 14:31

alisakwong 发表于 2014-8-25 20:13
C 下多了会自相残杀，下少了会被吃掉，难道这个不是经验得出来的吗？想不通好痛苦 ...

错在通过experience,可以想这事genetic决定的啊。。。不一定是通过experience学习来的

作者: alisakwong 时间: 2014-9-2 15:24

vampire_lily 发表于 2014-8-31 14:31
错在通过experience,可以想这事genetic决定的啊。。。不一定是通过experience学习来的 ...

啊，对，比如说那个什么鸟做窝的问题就是experience和genetic的问题。通啦~

作者: 阿拉梦 时间: 2015-4-15 16:12
对A的个人理解：题干说eggs个数需要in exactly the right numbers ，而要做到这样就必须已知一切条件，也就包括了已知host egg的最小体积。

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