题目

——Mr. Li is ill in hospital. His daughter is looking after him.——     .I’m sorry to hear that     B. Not at all  C. I’m afraid                 D. It doesn’t matter 答案:A在图a、图b中,能说明做功改变物体内能的是图(b)(b),其内能减小减小(填“增大”、“减小”或“不变”).
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