单选题：To protect himself and his eggs, the male sea horse does all

题目分类：理工类
题目类型：单选题
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题目内容：

To protect himself and his eggs, the male sea horse does all the following EXCEPT __________ . A．changing his color
B．gripping a piece of grass
C．staying motionless
D．enlarging his pouch

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答案解析：

It's impossible to approach this problem in this way,

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分类：理工类题型：单选题

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