The international body responsible for drafting the convention prohibiting marine pollution (MARPOL) is the（）.

单项选择题Providing you are not sailing in the Red Sea or another special area as listed in ANNEX V of MARPOL，how many miles from land must you be to throw garbage including bottles，rags，and glass that has not been ground up into the sea? （）

A.3 nm
B.6 nm
C.12 nm
D.25 nm

单项选择题Open ullage holes in tanks which are not gas-free must be protected by（）.

A.PV valves
B.warning signs
C.flame screens
D.stop-check valves

单项选择题Oil slick caused by spillage of oil from tanker ship is（）.

A.a drop of oil
B.the emulsion of oil at sea surface
C.the weathered oil
D.the oil floating on the surface of the sea water

单项选择题No person on board any vessel to which Annex V to MARPOL 73 78 applies may discharge garbage of any type when（）.

A.less than 12 nautical miles from PRC
B.less than 12 nautical miles from nearest land
C.in the navigable waters of the PRC
D.less than 25 nautical miles from nearest land

单项选择题No discharge into the sea shall contain（）in quantities or concentrations which are hazardous to the marine environment or chemicals or other substances introduced for the purpose of circumventing the conditions of discharge specified in MARPOL 73 78.

A.chemicals
B.chemicals or other substances
C.substances
D.other substances