单项选择题

The scientist and agricultural innovator George Washington Garver aided the economy of the South by developing hundreds of commercial uses for crops such as the peanut.

A．restored
B．stabilized
C．helped
D．changed
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单项选择题
An introverted person is inclined to be moody.
A．fanciful
B．changeable
C．depressed
D．gloomy
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