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
I seem to have reached a rather gloomy conclusion, but I think that something cheerful may still be derived ______ it.
A．of
B．off
C．from
D．with
单项选择题
The service operates 36 libraries throughout the country, while six ______ libraries specially serve the countryside.
A．mobile
B．drifting
C．shifting
D．rotating
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