单项选择题
Which of the following is the tone of this essay
A．Sarcastic and prejudiced.
B．Objective and detached.
C．Piercing and indifferent.
D．Impassive and hostile.
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单项选择题
George Valensi's patent lasted until 1971 because ______.
A．there were not enough TV stations to provide color programs
B．the color TV receiver was not available until that time
C．nobody would offer any reward for his patent prior to that time
D．his patent could not be put to use for an unusually long time
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