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describing
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单项选择题
A．They were protected by a strong United States Navy.B．They were supported by a well-developed railroad.C．Most crew members had experience on foreign ships.D．As part owners of the ships, captains got some of the profits.
A．They were protected by a strong United States Navy.
B．They were supported by a well-developed railroad.
C．Most crew members had experience on foreign ships.
D．As part owners of the ships, captains got some of the profits.
单项选择题
A．Its chemical elements must be studied.B．Its temperature must be lowered.C．Big spaceships must be built.D．Its atmosphere must be changed.
A．Its chemical elements must be studied.
B．Its temperature must be lowered.
C．Big spaceships must be built.
D．Its atmosphere must be changed.
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