题目

In my family, there are my parents, my grandparents, my brother and I. We are a happy family. My father is a teacher. He works in a school. He gets up early and works very hard every day. Sometimes he helps me with my homework. His students love him very much because he likes to help them. My mother is a writer. She doesn’t need to go to work but she writes books, cleans (打扫) the house and takes care of (照顾) us. My grandparents are old. They don’t have jobs. They stay at home every day, reading newspapers (读报) and watching TV. They go to bed early. My brother is a student. He i学习了内能及能量的转化和守恒后,同学们在一起梳理知识时交流了以下想法,你认为其中正确的是    A.做功改变物体的内能是不同形式的能的相互转化    B.热传递改变物体的内能是不同形式的能的相互转化       C.各种形式的能在一定条件下都可以相互转化 D.能量在转化和转移的过程中总会有损耗,但能量的总量保持不变
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