求助

xyzxf · 发表于 2010-1-25 07:45:46

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

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.

正解是C，我选的A，不过A的意思我好像没理解清楚，谢谢nn帮我翻译一下

我心向明月 · 发表于 2010-1-25 11:51:23

每个秋天，Croton's jays向南迁徙。Jays总是加入crookbeaks的迁徙队伍，他们有着相同的夏天和冬天栖息地。如果一只jay与相伴的crookbeaks分开了，它总是四处游逛直到碰上另一队crookbeaks。因此，croton's jays缺乏自己找到南迁路途的能力。

A：Croton's jays将他们的蛋放在crookbeaks的窝里，这些蛋在完成南迁的时候繁殖。

求助

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