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. 幼虫
Which of the following conclusions can properly be drawn from the information above? C
(A) The size of the smallest host egg that a wasp could theoretically parasitize寄生 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.作者: joyviva 时间: 2009-12-9 10:16
顶一下！请教大家，bow~~~作者: fearfree 时间: 2009-12-9 11:10
此虫在别人的蛋里产卵，数量不能多也不能少，不然导致孵化出的幼虫死亡 A 此虫的生产行为决定能寄生的最小蛋的大小 我认为是答案 B 宿主无法防御此虫的产卵行为 未确切表明 C；此虫基于经验来决定对哪种宿主产多少卵 未标明经验是fact的一种 D；少产卵将比多产卵让孵化出的幼虫更快死亡 无法推导 E；此虫直接观察得知宿主目标大小 未提及是否使用visual
期待公布答案作者: zscsl 时间: 2009-12-9 12:34
楼主是这样的 看第一句最后面 in exactly the right numbers for any suitable size of host egg~~~产卵的数量是根据合适的host egg的大小决定的。。所以A是对的 C嘛。。没关系吧。。根本得不出这个结论。。。 明白了啊？作者: gwinyu 时间: 2009-12-9 16:21
楼上正解,C选项的learn from experience 显然无关作者: joyviva 时间: 2009-12-9 16:27
谢谢大家的帮助，bow~~~