2. 外语
  3. ______granted by the federal government for inventions were at an annual average of 22,000, in the 1890s.

______granted by the federal government for inventions were at an annual average of 22,000, in the 1890s.

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问题 ______granted by the federal government for inventions were at an annual average of 22,000, in the 1890s.
选项 A、Patents
B、Prize
C、Investment
D、Monopoly
答案A
解析
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