问题
解答题
在半径为5cm的⊙O中，弦AB的长等于6cm，若弦AB的两个端点A、B在⊙O上滑动（滑动过程中AB的长度不变），请说明弦AB的中点C在滑运过程中所经过的路线是什么图形。
答案
解：可求得OC=4cm
故点C在以O为圆心，4cm长为半径的圆上
即点C 经过的路线是O为圆心，4cm长为半径的圆。
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在半径为5cm的⊙O中，弦AB的长等于6cm，若弦AB的两个端点A、B在⊙O上滑动（滑动过程中AB的长度不变），请说明弦AB的中点C在滑运过程中所经过的路线是什么图形。
解：可求得OC=4cm
故点C在以O为圆心，4cm长为半径的圆上
即点C 经过的路线是O为圆心，4cm长为半径的圆。
阅读下列短文，根据短文中的信息完成文后表格。（每空一词） Hi, Daming, You ask me about how to improve（提高） your English listening. Here are some advice(建议). I hope they can help you. ◆Relax(放松) yourself. Before you start listening to something, don’t get excited or nervous（紧张的）.You need to relax．This will help you with your listening. ◆Listen carefully to the first sentence. The first sentence tells a lot about the whole passage．For example，if，at the beginning，you hear “Our reporter says…”,you know you will hear a piece of news，not a children’s story, or a science report. ◆ Think when you’re listening. When you’re listening, try to do some thinking．For example, you can think of the following questions: When, where and how? What does the speaker want to tell us? In this way, you may understand the passage better. ◆Listen to important facts. It’s important for you to remember some important facts. For example, if the passage is a science report, you should try to remember its findings, and how the scientists get their results. This is also very helpful to your listening． Yours, Tom
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