单项选择题

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

A．Deliberate
B．Consistent
C．Primitive
D．Abnormal
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单项选择题
When trapped in drifting sands, do not struggle, or you will be ________ in deeper.
A．absorbed
B．pushed
C．heaved
D．sucked
单项选择题
Just as a book often judged ________ by the quality and appearance of its cover, a person is judged immediately by his appearance.
A．previously
B．uniquely
C．outwardly
D．initially
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