成都石室中学高2021届半期考试各科试题及答案

成都石室中学高2021届半期考试各科试题及答案,语文、数学、英语、物理、化学、生物、地理、历史、政治等 全部答案将汇总在答案海洋,谢谢各位的同学的分享! 
成都石室中学高2021届半期考试各科试题及答案
成都石室中学高2021届半期考试各科试题及答案
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Thomas Alva Edison
(爱迪生)was awarded more patents(专利) on inventions than any
other American. When he died in 1931, Americans wondered how they could best
show their respect for him .One suggestion was that the nation observe a minute
or two of total blackout. All electric power would be shut off in homes,
streets, and factories. Perhaps this suggested plan made Americans realize
fully what Edison and his inventions mean to them. Electric power was too
important to the country. Shutting it off for even a short time would have led
to complete confusion. A blackout was out of the question.

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