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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The sisters can't tolerate, each other.
A．bear
B．hate
C．like
D．criticize
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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