单项选择题

A．A fuel that burns cleanly.
B．An oil additive that helps cool engines.
C．A material from which filters are made.
D．An insulating material sprayed on engine parts.
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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.
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