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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单项选择题
After Tuesday’ s announcement, the OPEC is now producing ______million barrels of oil a day.
A．26
B．25.5
C．24.5
D．23.5
单项选择题
Which is NOT true prior to Professor Pornchai’s use of coffee as a paint
A．He got some inspiration from the Chinese.
B．He used tea to get an unsophisticated look for his paintings.
C．Tea could not produce clearly-defined paintings.
D．He experimented with coffee many times before he felt satisfied.
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