单项选择题

As a result of the lighting system, people ______.

A．have fewer headaches
B．needn’t concentrate as much
C．can work very hard
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单项选择题
The blinds in the gap move according to ______.
A．the air currents in the gap
B．the sun’s rays
C．the weather outside
单项选择题
A．downB．outC．up
A．down
B．out
C．up
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