Section_ⅠWelcome_to_the_unit_&_Reading_-_Pre­reading

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　　Advertisements

　　Nowadays, we can find advertisements① almost wherever we go② . We are so used to③them that we often do not even realize how many we see and hear in a day. I did some research on④ advertisements, and have some very important information to share⑤ with you.

　　What is an advertisement?

　　An advertisement uses words and pictures to persuade⑥ people to buy a product or service, or to believe in an idea. Newspapers, magazines, the Internet, radio and television are the most common places to find them. There are two main types of advertisements - commercial advertisements⑦ and public service advertisements⑧ (PSAs). A commercial advertisement is one which someone has paid for to advertise⑨ a product or service⑩. PSAs are often run for free⑪， and are meant to⑫ educate people about health, safety, or any other problem that affects public welfare⑬.

　　①advertisement/əd'vɜːtIsmənt/n.广告；广告宣传

　　②wherever we go是wherever引导的地点状语从句。用wherever不用where是表示强调。

　　③so ...that ...引导结果状语从句。

　　be used to 对......习以为常，习惯于，适应，to是介词。

　　④do research on 对......进行研究

　　⑤share vt.分享；分担；共有

　　share sth. with/among sb.与某人分享某物

　　⑥persuade/pə'sweId/vt.说服，劝说；使信服

　　persuade sb. to do sth.说服某人做某事

　　⑦commercial advertisements 商业广告

　　⑧public service advertisements 公益广告

　　⑨advertise/'ædvətaIz/vt.& vi.做广告；宣传

⑩定语从句which someone has paid for ...修饰one。