单项选择题

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单项选择题
A. He first speech on TV. B. He invented the TV set. C. He was the first person appearing on TV. D. He gave the first demonstration of a television picture.
A. He first speech on TV.
B. He invented the TV set.
C. He was the first person appearing on TV.
D. He gave the first demonstration of a television picture.
单项选择题
B
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