水手必须在能见度很好时，进行了望。
驾驶员必须在能见度不良时，进行了望。
水手必须在能见度不良时，进行了望。
驾驶员必须在能见度很好时，进行了望。
第1题：
While on watch at sea you must maintain a proper lookout at all times. On a 700-foot cargo vessel being hand-steered during daylight hours in good visibility and clear of any navigational hazards，the lookout may be ______.
A.the helmsman
B.the mate on watch
C.Either A or B
D.Neither A nor B
第2题：
If your vessel is the stand-on vessel in a crossing situation ______.
A.you must keep your course and speed
B.you may change course and speed as the other vessel must keep clear
C.the other vessel must keep her course and speed
D.both vessels must keep their course and speed
第3题：
The officer asked him ________ a sharp lookout for the fishing boats
A.to keep
B.keeping
C.keeps
D.keep
第4题：
Steer the wheel carefully and keep a sharp lookout （） .
第5题：
水手在船首进行了望。（）
第6题：
While on watch at sea you must maintain a proper lookout at all times. You are on a 200-foot cargo vessel with an unobstructed view astern from the steering position. The vessel is being hand-steered during daylight hours in good visibility and clear of any navigational hazards. The lookout may be ______.
A.the helmsman
B.the officer on watch
C.either A or B
D.neither A nor B
第7题：
Because of the （）, we have to keep a sharp lookout.
第8题：
Steer the wheel carefully and keep a sharp lookout .
A.look out
B.look around
C.look at
D.lookout
第9题：
Sailors should keep （）at sea.
第10题：
Sailors must keep lookout in poor visibility.（）