2. 外语
  3. Both cowbird and cuckoo chicks______. What do warblers do in order to be protected from cowbirds’ attack?

Both cowbird and cuckoo chicks______. What do warblers do in order to be protected from cowbirds’ attack?

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问题 Both cowbird and cuckoo chicks______.
What do warblers do in order to be protected from cowbirds’ attack?
选项 A、They push the cowbirds’ eggs out.
B、They provide food for the cowbirds’ young.
C、They disguise their eggs to look like those of the cowbirds.
D、They try to block the entrance to deny admission to cowbirds.
答案B
解析
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