单项选择题

A．Supply their own light.
B．Locate food and enemies.
C．Compensate for the lack of light.
D．Both B and C.
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单项选择题
A．Traveling a lot.B．Getting a lot of exercise.C．Working too hard.D．Waiting for the train.
A．Traveling a lot.
B．Getting a lot of exercise.
C．Working too hard.
D．Waiting for the train.
填空题
It is said that giving good telephone helps increase ______.
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