1.结构提示

With the fast development of modern mass media, more and more types of advertisements are emerging through different kinds of communication tools.

On one hand, public service advertisement plays an important role.

On the other hand, one of the most common advertisements are commercial adverts. Commercials are usually broadcast on TV.

2.要点提示

through television/radio mostly, broadcasting and encouraging healthy lifestyles/attitudes/values

publicize products, persuade consumption