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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单项选择题
A．Computer science.B．Physics.C．Chemistry.D．Mathematics.
A．Computer science.
B．Physics.
C．Chemistry.
D．Mathematics.
单项选择题
A．To inform.B．To entertain.C．Both.D．Neither.
A．To inform.
B．To entertain.
C．Both.
D．Neither.
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