单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．Only one hour.
B．Some hours.
C．One week.
D．Two weeks.
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填空题
Ordinary people laugh a lot when they are alone.
单项选择题
A．Computer science.B．Physics.C．Chemistry.D．Mathematics.
A．Computer science.
B．Physics.
C．Chemistry.
D．Mathematics.
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