单项选择题

You really ought to ______; all these late nights are doing you no good.

A．bring down
B．slow down
C．pull through
D．pass through
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单项选择题
Researchers have discovered in recent years that there is a system to the actions almost as consistent and______ as language.
A．comprehensive
B．comprehensible
C．observant
D．conceivable
单项选择题
This popular sports car is now being ______ at the rate of a thousands per week.
A．turned down
B．turned out
C．turned up
D．turned on
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