单项选择题

The child's abnormal behavior puzzled the doctor.

A．funny
B．frightening
C．repeated
D．unusual
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单项选择题
The price of vegetables varies according to the weather.
A．jumps
B．rises
C．falls
D．changes
单项选择题
Gunpowder was used extensively in firearms prior to 1990.
A．in
B．around
C．from
D．before
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