单项选择题

The price of vegetables varies according to the weather.

A．jumps
B．rises
C．falls
D．changes
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单项选择题
Gunpowder was used extensively in firearms prior to 1990.
A．in
B．around
C．from
D．before
单项选择题
Merge the following two short sentences into one new sentence.
A．Split
B．Combine
C．Break
D．Divide
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