高中三年级英语(人教版)全一册 Unit 5 Integrating Skills 2

　　The Internet is a relatively new medium for advertisements. Different kinds of ads are found on websites offering services and information. Some Internet ads are similar to traditional ones: "banner ads" are placed above or to the side of the content of a website. Perhaps the most exciting feature of Internet ads is that they are "interactive", ie potential customers can click the ads to find out more about a product or service they are interested in. Customers can also send in questions and comments to the company. Interactive ads can also change depending on your interests and habits. For example, if you often visit websites containing information about a certain hobby, sport, or lifestyle, the computer can keep track of your visits and send you ads about products you are likely to be interested in. As a result, two people who visit the same website may see different ads.

　　New technology also allows ad-makers to reach customers in new ways. "Pop-up ads" open in a small square when you visit a website. These ads can be annoying when you are trying to read or access information on a website. The least popular type of Internet ad is called "spam". It refers to advertisement messages that are sent via'e-mail to thousands of customers at a time. Spare is so unpopular that most e-mail services offer software that blocks unwanted messages. Spam also causes many problems, so some governments have made laws to limit spam.

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