答案　C　[从上文的TV，radio，newspapers，the Internet，and billboards可知，它们都是medium(媒体，媒介)。]

　　17．A.announcer

　　B．sponsor

　　C．agency

　　D．designer

　　答案　C　[广告代理机构代表公司发布广告。agency代理机构，符合语境。announcer广播员；sponsor赞助者；designer设计者。]

　　18．A.sent

　　B．stored

　　C．heard

　　D．read

　　答案　C　[从上文的Advertisements can also be seen可得到提示，在电话中可听广告，故选C。]

　　19．A.Companies

　　B．Organizations

　　C．Factories

　　D．Foundations

　　答案　B　[从下文的some nonprofit organizations可判断，此处指organizations(组织)。company公司；factory工厂；foundation基金会。]

　　20．A.make

　　B．buy

　　C．sell

　　D．provide

　　答案　C　[有些组织虽然花大笔的钱做广告，但不出售(sell)任何产品或服务。]

　　Ⅴ.阅读理解

　　“I don't want to write a story about girls！I don't know anything about girls.”Louisa May Alcott told her publisher，Mr Niles.But she was desperate for money.She seemed to be the only one in her family who could make some money.Niles had asked her to write something she knew，instead of the romantic adventure stories she had been writing.“So I plod away，”Alcott wrote，“though I don't enjoy this sort of thing.”It was 1867，and the horrible Civil War was over.Now Alcott could turn her energy to making money.

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