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

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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
单项选择题
A man escaped from the prison last night. It is a long time（）the guards discovered what had happened.

A．before
B．until
C．since
D．when
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