仁爱版英语九上topic2whenwasitdeveloped同步测试

仁爱版英语九上topic2whenwasitdeveloped同步测试内容摘要：

高清晰 ) television or the HDTV. The main difference between an HDTV and a normal television is the picture. It’s more clear and detailed. This is because the HDTV has many more points and lines that make a television image. Every color television picture contains thousands of red, green and blue points. They all e together as an image. The points are anized in lines that go across the television screen. There are more than five hundred lines in a normal television. The HDTV has two times as many. To get this clear picture, you must have a big screen. Experts say people using a small screen will see little difference. The HDTV also has clear sound. It’s like the sound on a CD. All these improvements make an HDTV very costly. One kind in Japan now sells for more than twenty thousand dollars. A major problem with the HDTV is its broadcast signal(传播信号 ). The signal is bigger than normal because it carries more electronic information. ( ) 26. What’s the main difference between an HDTV and a normal television? It’s _______. A. the picture B. the shape C. the points D. the weight ( ) 27. What’s a color TV image? A. It’s made up of thousands of red, green and blue points. B. Points are anized in lines that go across the TV screen. C. It’s a black and white picture. D. Both A and B. ( ) 28. How many lines does an HDTV have? A. Over 250. B. More than 500. C. More than 1 . About 250. ( ) 29. What should you do if you want to get a clear and detailed picture from an HDTV? A. You must have the bigger signal for the HDTV. B. You have to get a big screen. C. You should have a pact disc player. D. Both A and B. ( ) 30. According to the passage, which of the following is TRUE? A. The HDTV sets aren’t popular now because they’re too expensive for most people. B. The signal for the HDTV isn’t bigger than that for the normal TV. C. In the future the HDTV will cost 10 times as much as it costs now. D. Only Japan can make the HDTV. ( B ) We used to go into different chat rooms on different websites. If you wanted to meet someone on the Net, you had to go into the same chat room. But now regular Net surfers chat on OICQ. OICQ is an online chat software(软件 ) which was invented by Shenzhen Tencent Computer System Company in February, 1999. Since then it has swept the country. Its symbol is a penguin (企鹅 ) wearing a red scarf. Net friends can be divided into a buddy list (for good friends), a stranger list (for people you don’t want to talk with at once), or an ignore list (for people you never want to receive message from). You can also build up family lists, coworker lists, etc. You can know whether listed friends a。