單項選擇題

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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單項選擇題

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

單項選擇題

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