单项选择题

In the fifth paragraph the underlined phrase "on sale" probably means ______.

A．to display for selling
B．to sell at a higher price
C．to sell at a lower price
D．to give as a present
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单项选择题
How did the science of preparing metals for use happen
A．By any planned purpose.
B．By chance.
C．With fire.
D．On the part of those who were concerned about it.
单项选择题
What is the article mainly about
A．Fire and metals are both very important.
B．The science of preparing metal for use began before the use of fire.
C．Tools, weapon and decorations can only be made from metals.
D．Fire has been playing an very important part in their life and work since human beings mastered its use.
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