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
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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
单项选择题
A laser beam is used to ______even the hardest substance.
A．light up
B．repair
C．identify
D．penetrate
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