(2)根据课文内容填空(8分)There are two main types of advertisements— commercial advertisements and 4

问题补充：

(2)根据课文内容填空(8分)

There are two main types of advertisements— commercial advertisements and 41 service advertisements (PSAs). A commercial advertisement is one which someone has paid for to 42 a product or service. PSAs are often placed for free, and are 43 to educate people about health., safety, or any other issue which affects public 44 .

This 45 will give you some information about RealCine: how it works, why it is better than 46 cinema,

and how it can be used in other ways. I believe you will be 47 by the RealCine experience, and will agree

that this is an extraordinary 48 that must be developed further.41-48 41 public 42 promote 43 intended 44 welfare 45 proposal 46 ordinary 47 amazed 48 technology

答案：

(答案→)41-48 41 public 42 promote 43 intended 44 welfare 45 proposal 46 ordinary 47 amazed 48 technology

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