單項(xiàng)選擇題

Several shoals（）reported to exist in the area south-west of the Brothers.

A.have
B.have been
C.has
D.has been

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A system of cleaning the tanks by washing them with the cargo of crude oil while it is being discharged is known as（）.

A.cow
B.lot
C.cbt

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A vessel emitting harmful substances into the air or spilling oil into the sea is a（）.

A.polluter
B.emitter
C.spiller
D.oiler