题目

无人机已被应用于诸多领域，如图所示是一款四翼无人机。在无人机匀速上升过程中，对其分析正确的是A. 质量增加 B. 动能增加C. 重力势能增加 D. 机械能不变 答案：【答案】C【解析】无人机匀速上升过程中，无人机的质量不变，高度增大，重力势能增大；速度不变，质量不变，其动能不变；机械能等于势能与动能的总和，重力势能增大，动能不变，其机械能增大。 Amy: Hello, Roy. We are going to Baimai Spring Park. Will you join us? Roy:_________ I’m afraid I have to go to the art museum with my parents. Amy: Really?_______________Roy: Yes, I am. It’s fun to enjoy the beautiful paintings. Amy: I agree. What do you want to be when you grow up?Roy:___________And I have joined an art club where I can learn painting. Amy: Wow, that’s great. What other things are you going to do?Roy:___________Amy: That sounds wonderful.___________【1】A.I think so.B.I hope so.C.I’m not sure.D.Yes, please.【2】A.Are you interested in painting?B.Where do you learn painting?C.How do you get to the art museum?D.When are you going there?【3】A.I like painting very much.B.Let’s learn to paint.C.The painting show is wonderful.D.I want to be an artist in the future.【4】A.I’m going to study hard and enter an art college.B.My art teacher taught me how to paint.C.I have some excellent paintings.D.I attended many art classes.【5】A.That’s OK!B.Wish you success!C.Good idea.D.You are welcome.