抓抓求教道题。。。。想了很久没明白正确选项的意思。。prep07的cr 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.(这是什么意思??) (B) Host insects lack any effective defenses against the form of predation practiced by parasitic wasps.(不知道是不是lack) (C) Parasitic wasps learn from experience how many eggs to lay into the eggs of different host species.(不知道是不是from experience) (D) Failure to lay enough eggs would lead to the death of the developing wasp larvae more quickly than would laying too many eggs.(无关) (E) Parasitic wasps use visual clues to calculate the size of a host egg.(没说是不是visual) -- by 会员 ccmoom (2011/7/21 11:20:56)
A起就是题干里头结论(第一句话)的延伸哈。。第一句说wasps把卵产在宿主的host egg里头,而且产卵的数量非常精确地受到host egg大小的限制。后两句进一步解释说产太多了会怎么样产太少了会怎么样。所以综合这三个信息,就得到产卵的数量和宿主host egg的大小精确对应,知道其中一方的数据就可以推出另一方数据。
我的理解是这样,不知道对不对哈~ |