大全-9-20

juliaye717

  

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 .

A是答案，可是，根据原文，the wasp是通过host egg的大小来决定放几个蛋的，即the wasp’s egg-laying behavior can be determined from the size of the host egg .

可是A中正好倒了一下

leeon

the wasp’s egg-laying behavior：放多了会...，放少了又会...。因此exactly the right numbers for any suitable size of host egg。当然也就理论上决定了最小能lay  egg 的 host egg 的size了。这里的egg-laying behavior不是指结果放几个蛋(how many eggs laid)，而是黄蜂前面所表现的行为。

juliaye717

谢谢LEEON的解答

可我还是不太明白，如果“这里的egg-laying behavior不是指结果放几个蛋(how many eggs laid)，而是黄蜂前面所表现的行为。”，那么The size of the smallest host egg 和egg-laying behavior又有什么关系啊？

lawyer_1

A说的WASPS能寄生的最小寄主蛋的大小就是只能寄生一个WASP。将寄主蛋的大小除以寄生的WASP的数量，就得出一个WASP所寄生的寄主蛋的大小，WASP能寄生的最小寄主蛋的大小。

A所说的 wasp’s egg-laying behavior是指原文第一句话WASP的行为（ exactly the right numbers ）。正是基于这个行为，才能算出WASP能寄生的最小寄主蛋的大小。

juliaye717

顿悟了

LAYWER的解答好透晰啊，谢谢

xjlv128

说白了，原来是没看懂……

cielless

lawyer_1 发表于 2004-11-2 20:10
A说的WASPS能寄生的最小寄主蛋的大小就是只能寄生一个WASP。将寄主蛋的大小除以寄生的WASP的数量，就得出一 ...

同意！