单项选择题

As used in the last sentence, the word "drains" means ______.

A．stops
B．ties
C．weakens
D．flows gradually
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单项选择题
We learn from the passage that an emotion is created by something ______.
A．one thinks bad or good
B．one feels in danger
C．one faces in the outside world
D．one tries to escape from real life
单项选择题
We can safely conclude that a student may fail in an exam if ______.
A．he can not think properly
B．he can't pay attention to it
C．he can't finish it
D．he is not full of energy
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