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wasp产的eggs多少直接决定了成活率。如果host egg太小，wasp就会少产些，不然就多产些。可以说单位面积的卵数量守恒。
77. 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.
78 --〉The agrument of consumer health advocates focuses on whether candy bar can be addictive. Candy manufacturere fails to address this issue
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