单项选择题

______ human behavior may be caused by eating substances that upset the delicate chemical balance in the brain.

A．Deliberate
B．Consistent
C．Primitive
D．Abnormal
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单项选择题
It is due to the invention of the computer that man has been able to work so many wonders in the past few years. A case ______ is the successful launching of space shuttle.
A．in point
B．in question
C．in a way
D．in brief
单项选择题
His strong sense of humor was ______ make everyone in the room burst out laughing.
A．so as to
B．such as to
C．so that
D．such that
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