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
单项选择题
What is true of Sodium Permanganate as a paint
A．It is a suitable medium for tropical themes.
B．It is not suitable for old time themes.
C．The color changes from brown to purple.
D．The color does not stay.
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