2. 外语
  3. The passage is mainly about ______ . Georges Valensi’s patent lasted until 1971 because ______ .

The passage is mainly about ______ . Georges Valensi’s patent lasted until 1971 because ______ .

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问题 The passage is mainly about ______ .
Georges Valensi’s patent lasted until 1971 because ______ .
选项 A、nobody would offer any reward for his patent prior to that time
B、his patent could not be put to use for an unusually long time
C、there were not enough TV stations to provide color programs
D、the color TV receiver was not available until that time.
答案B
解析 细节题。在第四段中，Georges Valensi在1939年获得的对彩色电视接收器电器的专利得以延长到1971年，是因为在这个专利期限内的大部分时间还没有彩色电视，因此此发明也没有任何利益回报。所以B为正确答案。
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