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
If the right kind of extracurricular activities is organized, those children who have a (an) ______ of energy will have a chance to develop their talents much more quickly.
A．consumption
B．exploration
C．exhaustion
D．excess
单项选择题
No sooner had the man departed than the tree began dropping coffee beans ______.
A．by the thousand
B．by thousands
C．in thousand
D．of thousands
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