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F
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B
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.
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