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4. It takes us two days        (finish) one topic.

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 阅读理解。

  1      It has its own special words. One example is the word mouse. A computer mouse is not a small gray animal. It is a small device (设备)that you move around on a table in front of a computer. 2       

  3       People who are experts are sometimes called hackers. A hacker is usually a person who writes computer programs in a special computer language. But the word hacker is also used to describe a person who tries to steal information from a computer.

4       It is the name of a popular search engine (搜索引擎). People use the search engine to find information about everything on the Internet.

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