皮皮学，免费搜题
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【简答题】
Talk about your ways to keep healthy with your partner. You can take turns asking your partner the following questions. 1. What is this? 2. How often do you do this? 3. Who do you often do this with? 4. Why do you think this is good ?
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【简答题】切线和固定方向成固定角的曲线称为 .
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