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.
单项选择题
What effect does excessive positive onisation have on some people
A．They think they are mad.
B．They feel very tired.
C．They become violently sick.
D．They are too tired to do anything.
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