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标题: prep-85 [打印本页]

作者: jingjane222 时间: 2010-6-28 06:56 标题: prep-85

85.

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.

也许我想歪了，选C是不是证明croton's jays不能辨别跟错了伴，由此证明不能自己找到去南方的路，，和Tattersall warblers到北方去了？应该不是这样理解的吧。。。

请帮帮忙!!!

作者: mandying 时间: 2010-6-28 22:13

把C代入原文。

在秋天JAY要跟CROOKBREAK，在春天JA要跟TATTERSALL WARBLERS.更强调了JAY没有能力辨别方向。

是加强

作者: lingshihong 时间: 2010-6-30 06:39

可是题里说的是jay lack ablility to find their way south啊~C项里面说的是find way north的意思，这两个概念可以互相交换支持吗？？

作者: xiangrui 时间: 2010-7-2 06:38

我觉得如果找不到南，这鸟肯定也找不到北，所以只要说明他们找不到方向，就是支持。

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