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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单项选择题
Merge the following two short sentences into one new sentence.
A．Split
B．Combine
C．Break
D．Divide
单项选择题
Human facial expressions differ from those of animals in the degree to which they can be deliberately controlled and modified.
A．sufficiently
B．noticeably
C．intentionally
D．absolutely
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