48.    

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.

答案是A

我选了C,文中if条件说的是lay egg的数量太多和太少都不好,所以推出根据经验decide how many eggs to lay

A应尬怎么理解呢?

谢谢帮忙解答下吧

agree with 2rd floor.

I am confused by this question. Why choice A is right? The wasp's egg-laying behavior could determine the smallest host egg size.

Have anybody could tell me the reason? Thanks!!

A比较好, C为inference吧.

做归纳题需要注意的就是千万不要有自己的inference.  

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.

原文讲：PS把蛋下在HI的蛋中。WL互相竞食和空间，数量减少。HG减少WL。就是环境对数量减少增加的关系。

A) The size of the smallest host egg that a wasp could theoretically parasitize can be determined from the wasp's egg-laying behavior.行为决定大小。即影响和不影响。

B) Host insects lack any effective defenses against the form of predation practiced by parasitic wasps.HI缺少对W的抵抗。即缺少抵抗。

(C) Parasitic wasps learn from experience how many eggs to lay into the eggs of different host species。学习在不同HS生多少蛋的经验。即学习经验。

D) Failure to lay enough eggs would lead to the death of the developing wasp larvae more quickly than would laying too many eggs.下蛋少死的快与下蛋多的。即死的快慢。

是不是这个意思：

题目问的是Which of the following conclusions can properly be drawn from the information above?原文说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.   这里有个关键 就是exactly the right numbers

所以就有个   number  of eggs 和 size of  host egg 的对应关系.

而A 选项(A) The size of the smallest host egg that a wasp could theoretically parasitize can be determined from the wasp's egg-laying behavior.

number  of eggs 和 size of  host egg 的对应关系 就可以推断出来

就像做 x和y的 几元几次方程

打个比方    10个wasp egg  对应  100CM^3 host egg 。。。。。。。。   10x *  K = 100

              100个wasp egg  对应 1000cm^3 host egg ..........100X * K = 1000

              1000个wasp egg 对应 100000cm^3 host egg .......1000X * K = 100000

             最小的host egg 只能有3个wasp egg  .............. 3X*K =y

       那么通过各种统计学，数学公式就能推断出  最小的host egg的大小

这是我理解的

B .缺少抵抗 是无关的，提干直接说进去host egg了中间过程有没有遭遇反抗，没说，如果说反抗了 wasp照样能进去呢？所以是无关的

C. arasitic wasps lay their eggs directly into the eggs of various host insects in exactly the right numbers for any suitable size of host egg.这是一个既成事实。

而C 选项是arasitic wasps learn from experience how many eggs to lay into the eggs of different host species.
使怎么推断出这个继承事实，所以是推不出来了