单项选择题

A．They change color every 50 minutes.
B．They change color more quickly.
C．They change color more slowly.
D．They change color on the same schedule.
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单项选择题
A．They make him feel good.B．They make no impact on him.C．They bore him.D．They make him angry.
A．They make him feel good.
B．They make no impact on him.
C．They bore him.
D．They make him angry.
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