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.
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单项选择题
When was man's life changed in many ways
A．When he did.
B．It is not known.
C．When he learned how to make use of fire.
D．With fire.
单项选择题
From the passage, we know that ______.
A．music can be divided into slow music and fast music
B．whether slow music and fast music is effective or not depends on the background
C．music are always helpful to the overall sales
D．without music people have difficulty in shopping and having dinners
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