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．from
B．with
C．to
D．for
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The concert hall has a seating ______ of 1,000.
A．capacity
B．volume
C．vessel
D．amount
单项选择题
You see the lightning ______ it happens, but you hear the thunder later.
A．the instant
B．on the instant
C．for an instant
D．in an instant
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