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What kind of topics was The Oprah Winfrey Show centered on?The Oprah Winfrey Show was centered on ,many of which are ___.

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In the author's opinion, what kind of person is Oprah Winfrey?The author thinks that Oprah Winfreyis____, someone who would be _. She knows_____.

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液压泵是（）元件,是把（）能转换成（）能的装置。

液压缸是（）元件，把（）能转换成（）能的装置。