题目

如图所示，让太阳光通过遮光板M中的小孔S ，在M的右方放一偏振片P ，P 的右方再放一光屏Q ，现以光的传播方向为轴逐渐旋转偏振片P ，关于屏Q 上光的亮度变化情况，下列说法中正确的是A、先变亮后变暗   B、先变暗后变亮C、亮度不变      D、光先变暗后变亮，再变暗，再变亮   答案：C解析:略  A reader wrote to say that she was feeling lonely at break because her best friend wasn’t around. Here’s our advice to her — and to all kids who feel lonely sometimes.It’s hard when a best friend isn’t around — maybe because she moved to a different school or a different class. You may feel lonely at break or lunchtime. You want to have new friends. But how do you make them? Maybe it seems like everybody else already has their friends. But remember, there’s always room for more friends.Start by looking around your classroom — think about which kids you’d like to play with at break. Look for chances to say Hi to them, smile, and be friendly. Offer to share something or express your appreciation（欣赏）to them. Invite someone to play with you or say “Do you want to sit here?” in the lunchroom. When you’re at break, walk over to the kids you want to play with, act friendly, and say “Hi, can I play, too?” or just join in.If you have trouble doing this, or if you’re feeling shy, ask your teacher to help you make new friends. Teachers are usually pretty good at matching up friends. The best way to make friends is to be a friend. Be kind, be friendly, share, say nice things, offer to help — and pretty soon, you’ll have one, or two, or even more new friends.You might still miss that special best friend. But when you see each other, you can share something you didn’t have before she or he left. You can introduce her or him to your new friends!1.This article is written for _________.A.teachers B.parents C.students D.visitors2.According to the writer, some kids feel lonely at break because they _________.A.have trouble with their studiesB.don’t have their best friends aroundC.need their parents to be with thenD.are too young to look after themselves3.The underlined word this in Paragraph 4 refers to _________.A.sharing your ideas B.talking before many peopleC.studying better at school D.developing new friendship4.Some kids need help from teachers to make friends because _________.A.they miss their old friends a lotB.they have no time to stay with othersC.teachers know who wants a new friendD.they are shy or not good at making friends5.The best way to make friends is to _________.A.be a friend B.wait for a friend C.judge a person D.criticize a person6.What can you do when you meet your special best friend again?A.Invite her or him to your home. B.Introduce her or him to your new friends.C.Leave her or him alone. D.Give her or him a nice smile.