单项选择题

There is plenty of（）at this area.

A.a room
B.room
C.rooms
D.the room

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单项选择题

There is not（）depth of water around the area centered at the lighthouse.

A.ample
B.sufficient
C.enormous
D.incredible

单项选择题

The vessel was drifted off from her（）due to strong wind.

A.course
B.track
C.direction
D.trend

单项选择题

The use of the danger signal（）.

A.replaces directional signals
B.makes the other vessel the stand-on vessel
C.indicates doubt as to another vessels actions
D.is the same as a MAYDAY signal