单项选择题

It has often been stressed in the Courts that the look-out man should，preferably，be stationed forward，unless weather conditions make this（）.

A.possible
B.practicable
C.impossible
D.probably

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单项选择题

In the daytime，you see a large sailing vessel on the beam. You know that she is also propelled by machinery if she shows（）.

A.a basket
B.a black ball
C.a black cone
D.two black cones

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In restricted visibility the speed of a vessel without operational radar may be（）enable effective avoiding action to be taken on sighting another ship.

A.too low to
B.too high to
C.too high for
D.too low for

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In restricted visibility a towed vessel must sound a fog signal when it is（）.

A.the last vessel in the tow
B.the last vessel in the tow and it is carrying a crew
C.manned，regardless of its position in the tow
D.None of the above are correct