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A．When hunting for food.
B．When sleeping.
C．When being attacked.
D．When communicating with their cousins.
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单项选择题A．To tell the crab what time it is.B．To protect the crab from the sunlight and enemies.C．To keep the crab warm.D．To be of no real use.

A．To tell the crab what time it is.
B．To protect the crab from the sunlight and enemies.
C．To keep the crab warm.
D．To be of no real use.

单项选择题A．The same person--author of The Cat in the Hat.B．Friends of the speakers.C．Psychology professors.D．Fictional characters.

A．The same person--author of The Cat in the Hat.
B．Friends of the speakers.
C．Psychology professors.
D．Fictional characters.