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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单项选择题
All ______ is a continuous supply of food.
A．what is needed
B．the thing needed
C．for own needs
D．that is needed
单项选择题
Mrs. Smith went on a diet and in two months ______ her weight to 110 pounds.
A．brought out
B．brought off
C．brought down
D．brought up
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