单项选择题

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

A．Over the radio.
B．At a doctor’s office.
C．At the man’s house.
D．At a drug store.
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Last year’s robot race in Nevada was a great success.
单项选择题
A．At two o’clock.B．At three o’clock.C．At four o’clock.D．At five o’clock.
A．At two o’clock.
B．At three o’clock.
C．At four o’clock.
D．At five o’clock.
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