单项选择题

The UFO the people on board the plane saw is ______.

A．a long object
B．a square object
C．a round object
D．a short object
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单项选择题
Mr. Johnson preferred ______ heavier work to do.
A．to be given
B．to be giving
C．to have given
D．having given
单项选择题
The air inside a house on office building often has more contaminants ______ the heavily polluted air outside.
A．than does
B．as
C．as some that are
D．than that of
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