『CR』八月十日 罗技JJ 关于鸟儿迁徙 好像是prep上的一道题或变体 求确认

gege112

多谢狗妈妈~~~！！


Everyfall Croton's jays migrate south.  Thejays always join flocks of migrating crookbeaks with which they share the samesummer and winter territories.  If a jaybecomes separated from the crookbeaks it is accompanying, it wanders until itcomes across another flock of crookbeaks. Clearly, therefore, Croton's jays lack the navigational ability to findtheir way south on their own.
Whichof the following, if true, most strengthens the argument above?
A.Croton's jays lay their eggs in the nests of crookbeaks, which breed uponcompleting 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 Tattersallwarblers.
D.Species other than Croton's jays occasionally accompany flocks of migratingcrookbeaks.
E.In the spring, crookbeaks migrate north before Croton's jays do.

gege112

答案是C。

jetyxo

C 吧？

yuhong5200

A？