单项选择题

Questions 19 to 21 are based on the conversation you have just heard.

A．An air crash to Los Angeles.
B．A book written by a doctor.
C．A disease on the comeback and its reasons
D．Man’s effort to prevent disease.
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单项选择题
A．To buy some tools needed to repair the calculator.B．To ask the repair store to repair the calculator.C．To hit the display until it mobilized.D．To figure out what is wrong with the calculator.
A．To buy some tools needed to repair the calculator.
B．To ask the repair store to repair the calculator.
C．To hit the display until it mobilized.
D．To figure out what is wrong with the calculator.
填空题
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