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 subject of children starving to death is too _________ to joke about.
A．grim
B．grief
C．shrewd
D．snobbish
单项选择题
The accused man _________ his innocence by proving that he was aboard when the murder was committed.
A．found
B．founded
C．ignored
D．established
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