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單項(xiàng)選擇題

The general benefit of the GMDSS is to（）.

A.enable SAR operations to start with minimum delay
B.give facilities to marine communication
C.reduce sharply the chances of ship’s sinking
D.both A and C

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單項(xiàng)選擇題

By using previous communication system, rescue is often a matter of chance. What does “a matter of chance” mean?（）

A.occasionally
B.accidentally
C.often
D.usually

單項(xiàng)選擇題

We（）a sharp lookout while sailing in the iced waters.

A.keep
B.kept
C.are keeping
D.have kept