题目

下列分式的运算正确的是(   ) 答案：DThe rules（规则，常规） in American schoolsGreetingsYou needn’t greet your teachers when you come into a very big class. If you are late for class, you may go into the classroom quietly. But you should say sorry to the teacher after class.Answering questionsDon’t talk when somebody else is speaking. If you have something to say, you have to wait. When someone is speaking, you shouldn’t interrupt him or her. If you want to answer the teacher’s questions, you may stand up and speak loudly. It’s impolite to keep quiet when your teacher asks you questions. If you don’t know the answers, you can say “I’m sorry”.Other interesting rulesSome American schools don’t allow students to wear caps, sunglasses or too large trousers. And they can’t bring any bananas to school. The school bags for the students are usually sheer （透明的）, so teachers can find what’s in it easily.小题1:If you are late for class in American schools, what should you do? ________________________________________________________小题2:Is it polite to talk when someone else is speaking? ________________________________________________________小题3:When students want to answer the teacher’s questions, what should they do? _________________________________________________________小题4:In some American schools, students can’t do any things. Give an example.__________________________________________________________小题5:Why are the students’ bags sheer in some American school? _________________________________________________________