单项选择题
he oil（）in a source bed, and a marine shale.
A.dominates
B.originates
C.terminates
D.fascinates
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单项选择题
Eventually chemical changes（）the generation of petroleum.
A.hand in
B.give in
C.take in
D.result in -
单项选择题
As time goes on the organic material is buried deeper and hence（）higher temperatures and pressures.
A.is made up of
B.is absorbed in
C.is exposed to
D.is known as -
单项选择题
Petroleum is a result of the（）of plant or animal matter in areas which are slowly subsiding.
A.depression
B.description
C.destruction
D.deposition
