题干

平面镜成像在生活中有着广泛的应用,如图甲,服装店墙壁上会竖放着一块大平面镜,它的作用是____;如图乙,牙医用平面镜来诊断病情,它的作用是____

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\u5229\u7528\u5e73\u9762\u955c\u6210\u50cf\uff0c\u8bd5\u8863\u670d\u8005\u5728\u5e73\u9762\u955c\u4e2d\u53ef\u4ee5\u89c2\u5bdf\u5230\u81ea\u5df1\u6240\u8bd5\u8863\u670d\u7684\u60c5\u51b5,\u5229\u7528\u5e73\u9762\u955c\u6210\u50cf\uff0c\u4fbf\u4e8e\u77

同类题1

What do you like most when you can get one of such things: freedom, true friends, love, honesty and so on? Here are some choices of students:
Chen Cheng, 14, Jiangsu: I think I need a true friend. I had some friends before. However, it seemed that they didn’t treat(对待) me well. I told them my secrets but they didn’t share(分享) theirs with me. What’s worse, they told my secrets to others, which made me very unhappy. I hope to find a true lifelong(终身的) friend who can share happiness and sadness with me and keep my secrets.
Gan Xiaoning 14, Heilongjiang: Freedom is what I want most. I am a bird in two cages(笼子). In school, I have to follow the school’s rules and listen to teachers. At home, my parents don’t allow me to do what I like, either. I have to do everything that they tell me to do: study, study and study some more. So, freedom is the only thing I really want!
Yuan Siyu, 15, Guangxi: I am a boy from a poor family. My father works very hard but only makes a little money every month to support(支撑) the family. I want to go to a key university (重点大学)so that I can find a good job in the future. Then, I can earn enough money to get my family out of poverty(贫困) and offer my parents a happy life.
Qu Yi, 15, Hebei: I want a complete family. My parents got divorced(离婚) three years ago. Since then, I have had no chance to be together with both of them any more. Now, I am living with my mom and get her love, but I also want my dad’s love. I am envious(羡慕) of my classmates who live with their parents. So, I would have a complete family if I could.