单选题：It can be inferred from this passage that the feathers of a

题目分类：卫生类
题目类型：单选题
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题目内容：

It can be inferred from this passage that the feathers of a bird are colored A．to frightened its enemies
B．to attract its enemies
C．to adjust its body heat
D．to match its environment

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I catch a cold now and then.

I catch a cold now and then.A．always B．occasionally C．constantly D．regularly

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