大全-9-20

applemusic · 发表于 2003-12-2 23:02:00

20 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.
(C) Parasitic wasps learn from experience how many eggs to lay into the eggs of different host species.
我选的3答案给的1

番茄炒蛋 · 发表于 2003-12-3 01:12:00

原文中有一个 for any suitable size of host egg
那么怎么才是sutiable呢，什么卵可以产子，什么卵太小或是太大不可以产子，那就需要通过the wasp’s egg-laying behavior来determinged

c错的，因为无法凭经验得知host会有几个卵，就像我们去吃饭无法知道今天食堂会有几个菜一样，而且这个卵的数量还要非常精确，靠经验怎么可能会那么精确呢

一起加油的夥伴 · 发表于 2005-11-15 14:17:00

其實這一題我也非常的糊塗,

原文中有說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.

--->所以可知,寄生時決定的是寄主蛋的大小

(A) The size of the smallest host egg that a wasp could theoretically parasitize can be determined from the wasp’s egg-laying behavior.決定的是寄主蛋的大小

(C) Parasitic wasps learn from experience how many eggs to lay into the eggs of different host species.決定的是寄主蛋的數量多寡

不曉得我的理解是否錯誤,歡迎指正

[此贴子已经被作者于2005-11-15 14:19:11编辑过]

大全-9-20

大全-9-20

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