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阅读理解
In the 20th century, advertising has become very popular．Why is it so popular? Because it has been proved that repeated advertising can increase product sales and make the price of products lower．
Advertisements can be made in many ways．People in the U．S．A．and Europe use them to advertise all kinds of products, services and other things as well．People use large boards, signs inside or outside shops and cinemas, printed mails or gifts to make advertisements．Besides, balloons and aeroplanes are also used．
An advertisement, however, should be properly designed to avoid waste．How is an advertisement made? An advertising firm(公司)selected a company designs and makes the advertisement by studying the information about customers and products．The designers put forward their different plans with pictures or photos．When the advertisement is ready, it is tested in a place to see whether it can make the product popular with customers or not．If it does, it will be used all over the country．Otherwise it should be designed until it is accepted by customers and market by finding out the reason for the failure．
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