【鳥遷徙】罗技

cloudballoon · 发表于 2011-9-12 20:21:15

【类似prep题】 by yaoyaochloe （题干意思一致，但它问的是加强）
Every fall Croton's jays migrate south. The jays always join flocks of migrating crookbeaks with which they share the same summer and winter territories. If a jay becomes separated from the crookbeaks it is accompanying, it wanders until it comes across another flock of crookbeaks. Clearly, therefore, Croton's jays lack the navigational ability to find their way south on their own.
Which of the following, if true, most strengthens the argument above?
A. Croton's jays lay their eggs in the nests of crookbeaks, which breed upon completing their southern migration.
B. The three species most closely related to crookbeaks do not migrate at all.
C. In the spring, Croton's jays migrate north in the company of Tattersall warblers.
D. Species other than Croton's jays occasionally accompany flocks of migrating crookbeaks.
E. In the spring, crookbeaks migrate north before Croton's jays do.

鸟儿题削弱
有两个答案 1. J 要产蛋再 C的巢里
2. 可以防御天敌
如果照这样描述我会选 2.
因为可以先飞去等C出现在产蛋呀~
但飞的过程中如果没有C 可能就会被天敌吃了

verkerk · 发表于 2011-9-12 20:32:51

削弱应该选A，
原题的意思是 jay跟着别人飞的原因是它自己不认路
A的意思是 jay跟着人家，是为了让人家帮它孵蛋，跟认不认路没关系

fovfans123 · 发表于 2011-9-20 13:37:47

这题的确是prep原题,昨天模拟的时候遇到了,还有俄国妇女运动那个

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