单项选择题

Part of the lake has been polluted. You can see the water is covered with ______ oil.

A．a coat of
B．a story of
C．a film of
D．a pad of
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单项选择题
The old couple were not rich themselves, but they hated to turn away anyone who were ______ food and shelter.
A．at the mercy of
B．on the point of
C．with the exception of
D．in need of
单项选择题
Living in the central Australian desert has its problems, ______ obtaining water is not the least.
A．of which
B．for what
C．as
D．whose
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