题目内容
（请给出正确答案）
When will the station begin operation？
A．Today.
B．In April.
C．Next semester.
D．No 'one knows for sure.
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B．Through telephones.
C．Through being brought to the radio station.
D．Through the internet.
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A．In the restaurant.
B．In the police station.
C．In the school.
George Valensi's patent lasted until 1971 because ______.
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B．the color TV receiver was not available until that time
C．nobody would offer any reward for his patent prior to that time
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