单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．In a doctor’s office.
B．In an operating room.
C．In a professor’s office.
D．In a gymnasium.
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单项选择题
A．howB．whereC．whenD．whether
A．how
B．where
C．when
D．whether
单项选择题
After radio had developed to a very high level, what appeared as a necessary result
A．Television and radar.
B．Modulated light and a scanning wheel.
C．Superior television camera.
D．Microphones and loudspeakers.
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