单项选择题

According to the talk, what did David Sarnoff predict about radios

A．They would get smaller in size.
B．Their signals would travel further.
C．They would become less popular than television.
D．They would be common household items.
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Why does the man want to take a class at the community college
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B．It has a pool.
C．The class size is smaller.
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What does the woman imply about sea monsters
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