单项选择题


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

A．Physics.
B．Computer science.
C．Tourism.
D．Mechanical engineering.
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B
单项选择题
A．Old people.B．Teenagers.C．Infants.D．Adults.
A．Old people.
B．Teenagers.
C．Infants.
D．Adults.
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