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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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
单项选择题
Before the invention of photoengraving,steel and copperplate engraving served as the principal means of reproducing illustrations.
A．visions
B．pictures
C．advertisements
D．pages
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