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.
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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.
单项选择题
A．Her car is being repaired.B．Parking is difficult in the city.C．The cost of fuel has increased.D．She wants to help reduce pollution.
A．Her car is being repaired.
B．Parking is difficult in the city.
C．The cost of fuel has increased.
D．She wants to help reduce pollution.
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