单项选择题

What channel is general communication used?（）

A.any appropriate channel except public communication
B.any appropriate channel except for public communications
C.any appropriate channel besides public communication
D.any appropriate channel beside public communication

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General communications are those communications（）.

A.between ship stations and shore-based communication networks
B.concern the management and operation of ships
C.may have an impact of the safety on ships
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What’s the advantage when using the satellites?（）

A.The message can be directed to the desired location
B.The message can follow the earth‟s curvature
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Some radio waves（）the surface of the earth because of its（）.

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B.can follow / altitude
C.can hardly follow / shape
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