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單項(xiàng)選擇題

（）is the most visible signal of distress from a lifeboat at sea in the daytime.

A.Smoke signal
B.Flash signal
C.Fire signal
D.Radio emergency transmission

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單項(xiàng)選擇題

（）that kind of weather persist, it would be very likely that the two vessels would touch each other.

A.If
B.Would
C.Shall
D.Should

單項(xiàng)選擇題

（）view of the fact, I wish to submit this report.

A.In
B.On
C.To
D.For

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