单项选择题

According to the talk, who owned the receivers in the early days of radio

A．Military communications officers.
B．People who treated radio technology as a hobby.
C．People who lived in big cities.
D．People with an interest in music

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单项选择题

According to the news, the world’s highest railway climbs to more than ______.above sea level.

A．2,500 meters
B．5 kilometers
C．1,500 meters
D．500 meters

单项选择题

What is the talk mainly about’

A．Advantages of the North in the Civil War.
B．Civilian opposition to the Civil War.
C．Reasons to justify fighting the Civil War.
D．Military strategy used in the Civil War.,’

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According to the talk, who owned the receivers in the early days of radio