feifei 76 前人未解之谜 求助~~O(∩_∩)O~

yahoochao

76. Learning how to build a nest plays an important part in the breeding success of birds. For example, Dr. Snow has recorded the success of a number of blackbirds in several successive years. He finds that birds nesting for the first time are less successful in breeding than are older birds, and also less successful than they themselves are a year later. This cannot be a mere matter of size and strength, since blackbirds, like the great majority of birds, are fully grown when they leave the nest. It is difficult to avoid the conclusion that they benefit by their nesting experience.

Which one of the following, if true, would most weaken the argument?



(A) Blackbirds build better nests than other birds.

(B) The capacity of blackbirds to lay viable eggs increase with each successive trial during the first few years of reproduction.

(C) The breeding success of birds nesting for the second time is greater than that of birds nesting for the first time.

(D) Smaller and weaker blackbirds breed just as successfully as bigger and stronger blackbirds.

(E) Up to 25 percent of all birds are killed by predators before they start to nest.

正确答案是B。这个我以理解。我的疑问是，从This cannot be a mere matter of size and strength开始到最后这几句话的作用？我怎么觉得都是废话？？请NN指点~~

This cannot be a mere matter of size and strength开始到最后这几句话的作用？我怎么觉得都是废话？？请NN指点~~

fannybeibei

听LZ一说，我突然觉得就第一句最重要了～～～
不过还是看完吧

bonnie0715

“This cannot be a mere matter of size and strength, since blackbirds, like the great majority of birds, are fully grown when they leave the nest. It is difficult to avoid the conclusion that they benefit by their nesting experience. "
这里它是排除了大小和强壮的影响，比如说黑鸟第一次生小黑鸟的时候个头还太小，力气还太少。他说他开始生育了已经发育完全了排除了大小和强壮的原因。排除他因是没用的。因果关系混淆才最重要。
最后一句
It is difficult to avoid the conclusion =it can be conclude that。

bonnie0715

B。文章说筑巢越筑越好，生小鸟越生越好。所以筑巢对生小鸟有帮助。严重flaw。它每次生小鸟都是一个有用的生小鸟精力都可以帮助它下次生的更好。只不过筑巢跟它同时发生而已，典型的 casual over simplified。

打个比方，小明每天上补习班都要骑车，后来小明车骑的越来越好，成绩也越来越好。不能说骑车对小明上学有帮助吧。而是因为小明天天上补习班成绩才好的

yahoochao

自己顶顶~~~O(∩_∩)O~希望有人解答
如果真是没有的东西，那为什么还要给出来？但做题时，好像真的用不上！