单项选择题

It is useful to be able to predict the extent______ which a price change will affect supply and demon.

A．from
B．with
C．to
D．for
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Watching me pulling the calf awkwardly to the barn, the Irish milkmaid fought hard to ______her laughter.
A．hold back
B．hold on
C．hold out
D．hold up
单项选择题
All the communists ______the people instead of being served by the people.
A．are supposed to serve
B．are opposed to serving
C．are subjected to serving
D．object to serving
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