单项选择题

Can you ______ any smell of the gas which is escaping

A．discover
B．detect
C．find
D．spot
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单项选择题
______ capitalism has been abolished ______ it be possible to abolish poverty, unemployment and war.
A．Only if, will
B．If only, would
C．Should, will
D．Unless, would
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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