单项选择题


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

A．John’s phone wasn’t working.
B．John wasn’t at home when she called.
C．The woman didn’t get the right phone number of John’s.
D．John was too busy to come.
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单项选择题
Which scientist first applied the theories of radio waves to practical devices
A．Nikola Tesla.
B．Guglielmo Marconi.
C．Clerk Maxwell.
D．Heinrich Hertz.
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