单项选择题

Spreading oil on the open sea has the effect of（）.

A.diminishing the height of the seas
B.lengthening the distance between successive crests
C.increasing the height of the seas
D.preventing the wave crests from breaking

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Sour crude oil（）.

A.contains high quantities of hydrogen sulfide
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C.is lighter than other crudes
D.is less hazardous to load than other crudes

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Releasing oil from the sea anchor of a survival craft may（）.

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A.exerted by liquid cargo on the sides of a tank
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