单项选择题

A．Physics.
B．Mathematics.
C．Environmental science.
D．Life science.
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单项选择题
A．To escape from their enemies.B．To catch more food.C．To use their developing flippers.D．To swim.
A．To escape from their enemies.
B．To catch more food.
C．To use their developing flippers.
D．To swim.
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