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The computer was one of the most important inventions of last century. The first computer was as large as a room. Now some computers are as (1)　as television sets. Some computers can even be made smaller (2)　a book. About 20 years (3)　 , the computer was a strange machine in China. Not many people (4) it and said yes to it.

Today much of that is(5)　. In 1984, when Deng Xiaoping (6)　two pupils working on the computers in Shanghai, he said that computer lessons (7)　start from children. So there was the first computer book for middle school students. Now in Shanghai (8)　all middle schools have classrooms (9)　　　　　computer courses. Some of the students now have their (10) computers at home. With the help of Internet, they can send and (11)messages and e-mails. They can learn about the world (12)　.Now computers are (13)　used in banks, factories, airports and so on. The computer is coming in everyone’s (14)　, so it is important for us to learn (15)　to use a computer freely.

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阅读下面短文，从每题所给的A、B、C、D四个选项中，选出最佳选项。

　　Have you ever dreamed about a trip to space? Seeds(种子)of some vegetables and crops are a lot luckier than you, as they have travelled to space and back．

　　China is among the three countries in the world that carry out agricultural(农业的)research in space．The others are Russia and the U．S．Since 1987, China has sent about 1000 kinds of seeds into space．These include green peppers, tomatoes, cucumbers, carrots and rice．Even on China's first manned spacecraft Shenzhou V there were some seeds from Taiwan．

　　“Conditions(条件)in outer space such as radiation(辐射)and low gravity can cause big changes in the seeds, ” said Chinese researcher Jin Xing．

　　But not all seeds are better after going to space．After returning to the earth, the best seeds are chosen．These seeds produce much more and also grow faster than normal seeds．As the safety of genetically modified(转基因)food is still being talked about, some people are not sure about the safety of these “space vegetables” because some of their genes(基因)are changed during the trip to space．

　　But Jin holds the more hopeful view．He said, “Unlike genetically modified crops, no new genes are introduced to the space vegetables, so they are surely safe．”

　　Space vegetables are better than normal vegetables．For example, space tomatoes stay fresh for twenty days, which is one week longer than normal tomatoes．Another popular space vegetable is the peppers．Space peppers have 20 per cent more vitamin C than normal peppers．

　　Researchers are considering holding a tomato festival．By the time people will be able to enjoy about 30 different kinds of space tomatoes on their dining tables．

　　So far, the Chinese Academy of Sciences has set up three space vegetable base fields, one of which is in Shenzhen while the others are in Beijing and Jiangsu Province．

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