prep上的一道conclusion

daier

Q25. p1-cr48.(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.

(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.

答案：A
谁能告诉我一下怎么推出来的？

sayysong

B中的defencses是新的概念
C中的experience是新概念
D中的两者比较是题目没涉及的
E中的visual clues和calculate也是题目没涉及的

题目只说了wasp parasitize eggs数量是定数，因此通过数量可以得到size。
当然，还需要辅助一些其他的条件，这些条件可以from wasp's egg-laying behavior