A.rainB.frostC.sleetD.snowWhich of the following is not……

单项选择题Waves formed by the wind blowing far away are known as（）.

A.sea
B.current
C.tide
D.swell

单项选择题If the moisture content of the cargo sample is（）the Transportable Moisture Limit,then the cargo should be safe to load.

A.above
B.below
C.equal to
D.uncertain

单项选择题The amount and accuracy of the information provided on the different charts（）considerably.

A.varies
B.maintains
C.Shifts
D.assembles

单项选择题When you read the sailing directions, you should notice that this is one of a series of publications produced by the（）which should be consulted by users of Admiralty Charts.

A.UK Hydrographic Office
B.IMO
C.International Hydrographic Organization
D.International Association of Classification society

单项选择题When are you allowed to throw plastic garbage overboard?（）

A.Being mroe than 25 miles from shore
B.Only at night when it‟s dark
C.Being more than 6 miles from shore
D.Never