单项选择题


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

A．$36.
B．$40.
C．$100.
D．$150.
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单项选择题
A．It often requires long distance between the lovers.B．It may last for a long time.C．It is difficult to get.D．It helps people achieve success in careers.
A．It often requires long distance between the lovers.
B．It may last for a long time.
C．It is difficult to get.
D．It helps people achieve success in careers.
单项选择题
What discovery made live voice broadcasting become a reality
A．Carbon filament.
B．Diode.
C．Triode.
D．Wireless telegraph.
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