阅读理解。 The Internet is a big place. Nobody has the time to look at every webpage to find something. Search engines (搜索引擎) like Yahoo give us a lot of help. Two Stanford University students, David Filo and Jerry Yang started it in 1994. They made a list of their favorite webpages. When their list got bigger, they made a database (数据库) to keep all the information. They let everyone use it for free. Soon, thousands of people were using it. They then made a new kind of software (软件). It looked at web pages all over the Internet. It could then take that information and arrange it for someone to look at. If you look for 'animals', the engine will give you a list of web pages with those words. Yahoo became a public (公共的，公开的) company in 1996. Filo and Yang, still young men, became rich. As the company grew, they went on working hard. They improved the software. They also put more uses in, like shopping, free E-mail, booking tickets and so on. They started Yahoo in many different countries and languages. Yahoo. Com is famous on the Internet. And unlike most other web companies, Yahoo really makes money. 1. When Yang and Filo wrote the first Yahoo software, they _____. [     ] A. made people to use it B. were still university students C. knew it wasn't useful D. were high school students 2. After Yang and Filo became rich, they _____. [     ] A. became lazy B. worked less C. kept working hard D. stopped working at Yahoo 3. What Yahoo services (服务) are not mentioned in the passage? [     ] A. Buying and selling stocks. B. Search engine. C. E-mail. D. Booking tickets. 4. Which of the following is true? [     ] A. Yahoo was always a big company. B. Yahoo is a private company. C. Yahoo does not make people pay for their E-mail service. D. Yahoo is losing money. 5. What does the passage think of most Internet companies? [     ] A. They don't earn much money. B. They are all famous. C. They are just like Yahoo. D. They are all in English.