单项选择题

I told him that I would ______ him to act for me while I was away from office.

A．identify
B．authorize
C．rationalize
D．justify
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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
单项选择题
Digital recording has made ______ a significantly wider dynamic range, in recorded music.
A．for the possibility
B．the possibility is
C．it is possible
D．possible
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