单项选择题

By the time he was ten years old, Beniamin Oliver Davis Jr. had already decided his career would be in the air force.

A．uniform
B．vocation
C．education
D．rank
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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
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
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