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
Just as a book is 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
单项选择题
The back garden of our house contains a lawn, __ very pleasant to sit on in summer.
A．which is
B．which it is
C．it is
D．where it is
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