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.
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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
单项选择题
Supermarket should play slow music because ______.
A．they think that will make shoppers slow in deciding what to buy
B．they believe that will make salesmen and saleswomen work slowly
C．it offers customers more time and opportunities to find what they want to buy
D．the supermarket will be famous for it's slow music
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