单项选择题
A.at B.by C.in D.on
I have been instructed that on my voyage（），I shall call...
单项选择题I have been instructed that on my voyage（），I shall call at Maderra to pick up some cargo.
A.home B.family C.China D.returning
I am ready（）tow line.A.castB.to cast ofC.cast offD.to c...
单项选择题I am ready（）tow line.
A.cast B.to cast of C.cast off D.to cast off
How should the letter O be pronounced when spoken on th...
单项选择题How should the letter O be pronounced when spoken on the radiotelephone?（）
A.OCK TOW BER B.O RI AN C.OSS CAH D.OA KAM
