单项选择题

Which is NOT one of the difficulties with coffee as a medium

A．It is of sticky and elastic texture.
B．It cannot be used to paint lighter areas.
C．It is difficult to control on paper.
D．It is difficult to preserve.
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单项选择题
The second-step reduction is based most probably on ______.
A．the desire to raise oil prices
B．the consideration that the demand may decrease
C．OPEC’s production capability
D．the fact that oil prices are unstable
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