单项选择题

The scientist and agricultural innovator George Washington Carver 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
Project Skylab was designed to demonstrate that a person can work and live in space for prolonged periods without ill effects.
A．unexpected
B．obvious
C．adverse
D．immediate
单项选择题
Mary boasted that she would succeed where others had failed.
A．threatened
B．warned
C．bragged
D．joked
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