Clean your computer with free online software that detects spy-ware and install a firewall (防火墙) to ensure the sites you shop on don' t install spy-ware on your computer.

　　1. While shopping online, you should

　　A. be sure nobody is standing beside you

　　B. only shop at the site that you have often visited

　　C. find out how the personal information will be used

　　D. never provide personal information

　　2. According to the passage, if you find your credit card has unexplained charges, you should

　　A. tell your credit card company as soon as possible

　　B. change your credit card code number immediately

　　C. check all the websites you have visited

　　D. use a debit card instead of a credit card3. The underlined word "precaution" in Paragraph One means something done to_______.

　　A. make suspicious—looking people go away

　　B. protect you against loss or possible dangers

　　C. remind you to obey the rules when sopping online

　　D. avoid being cheated when eating in a restaurant

　　4. What is not advised by the writer when shopping online?

　　A. Using credit cards.

　　B. Installing a firewall.

　　C. Visiting famous websites.

　　D. Being very careful.

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