Now more an8more people buying and selling things on the Internet．They buy and sell goods to make money．so hackers（黑客）around the world are interested in this．

Hackers are often young people who love computers greatly．They use computers to get on the Internet，looking for ways to go into computers system run by banks，homes and all kinds of offices．If they go into a computer system） they will find other people's credit cards（信用卡）and try to steal the numbers．Wich the numbers they can take the money out of the bank．

Hackers often break in yo硅f computer system，but it's difficult to find them．So it is also difficult for you to find the hacker who is taking your money out of the bank．Hackers can get the money from a bank with the credit card number they have got from your computer．

Scientists always ask people who have computers to pay attention to hackers．They also tell people how to fight the hackers．The answer is to choose clever numbers and change them often and not to show your credit card out to anybody．If you are not careful，it's just like keeping the bank door wide open．

根据短文内容，选择最佳答案．

26．Hackers around the wor4are interested in___．

A．more and more people

B．people's buying and selling things on the Internet

C．the different banks

D．all kinds of offices

27．Hackers look for ways to go into computer systems to___

A．steal money directly

B．get people's credit cards

C．steal the numbers of people's credit cards

D．find the bank

28．It's___ to find the hackers if they break in your computer system．

A．Easy

B．Hard

C．Useful

D．best

29．Hackers can get the money from a bank___．

A．With the credit card number they have got from your computer

B．with their own credit card number

C．with anything

D．with the computer system they have known

30．Which of the foll