單項選擇題

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
C.The quality of message can not be affected by climatic
D.the range of the message extend and the quality of reception is improved

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單項選擇題

Some radio waves（）the surface of the earth because of its（）.

A.are capable of following / distance
B.can follow / altitude
C.can hardly follow / shape
D.are unable following / angle

單項選擇題

Ships equipped with Inmarsat SES send distress alerts both（）.

A.quick and good
B.convenient and certain
C.easily and simply
D.important and difficult