单项选择题

A．It’s author is unknown.
B．It’s useful as a teaching tool.
C．It uses an extensive vocabulary.
D．Children find it repetitive and boring:
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单项选择题
A．Identifying and collecting food.B．Protecting themselves.C．Eating food.D．Fighting against the enemies.
A．Identifying and collecting food.
B．Protecting themselves.
C．Eating food.
D．Fighting against the enemies.
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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