Traveling to work by car gets more expensive today．People can do nothing about the world’s price of petrol(汽油)．They have to go to work, so they have to pay．However, some people are trying to stop driving to work．

　　People are looking for a cheaper means of transportation and they have found out that it is a good choice to ride bikes to work．More and more people return to bikes．

　　Children often go to school by bike．But now businessmen are going to work by bike, too．“The bike is easy to use,” says Molly, “and it is also very cheap．It is a good choice for those who do business like me．You can buy thirty bikes for the price of a small car．A bike doesn’t use expensive petrol．A 10－year－old child can learn to take care of a bike．And most bikes can be used for a long time．”

　　Mr Brown goes to his hospital by bike every day．He says, “A bike doesn’t cost a lot of money, and most families can have two or more ones．Bike riding is good for our health．Today most of people get fat because they don’t get enough exercise．So I tell all my patients to buy bikes．Besides, in big cities it’s usually quicker to travel by bike than by bus or by car．Drivers can’t do anything but get angry when there is a traffic jam”(交通堵塞)

根据短文内容，选择最佳答案。

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阅读下面的短文，从A、B、C、D四个选项中选出一个能填入短文相应空白处的最佳答案。

　　We live in“computer age(时代)”．People like using computers to do 　　1　　 work．But more than 20 years ago, 　　2　　 couldn't do much．They were very big and expensive．Very 　　3　　 people were interested in them and knew how to use them．Today computers are smaller and 　　4　　 ．Since they are useful, many people like to use them, even at home．

　　Computers 　　5　　 very important because they can work 　　6　　 than men and make fewer mistakes．Computers can 　　7　　 people do a lot of work．Writers can use computers to write．Teachers can use computers to help teaching and students use them to study．Computers can also remember what you put 　　8　　 them．Computers are very 　　9　　．They are our good friends．Do you want to 　　10　　 a computer．

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