Both cowbird and cuckoo chicks. Cowbirds do the following except.

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问题 Both cowbird and cuckoo chicks______.
Cowbirds do the following except______.

选项 A、use tricks that seem to be even unmatched by the Mafia.
B、run protection businesses to make others raise their young.
C、time the laying of eggs to coincide with that of the warblers.
D、kill the warblers’ eggs to reset the time for warblers to hatch.

答案C

解析

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