单项选择题

It is useful to be able to predict the extent（）which a price change will affect supply and demand.

A．with
B．from
C．for
D．to

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Do yon remember（）Professor Fan during your last visit

A．introducing
B．being introduced to
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All（）is a continuous supply of electric power.

A．that is needed
B．what is needed
C．which is most important
D．for our needs
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