单项选择题

Do they have ______ air-conditioners for cooling the rooms in hot seasons

A．many a
B．enough
C．a great deal of
D．a hit of
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单项选择题
There is a (n) ______ cottage on the slope of that mountain.
A．old little white
B．old white little
C．white old little
D．little old white
单项选择题
We must be ______ our guard against this kind of disease.
A．on
B．in
C．with
D．for
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