IBT结构提纲

　　Intro: prohibited

　　Body :

　　1. social etiquette

　　2. harm a person' s health Transitional words: for one thing, for another, in recognition of those above

　　结语 :

　　Sample answer:

　　I strongly agree with the opinion that cell - phone usage should be banned in some places like concert halls, movie theaters or in some situations like when you are driving in cars or taking a subway, when you are in flight, in classes or meetings.

　　For one thing, it has become social etiquette. The cell phone user should know when and where to pick up the cell phone and talk. Though people have personal right to use their phone, the others are not supposed to be involved in the unnecessary disturbance.

　　For another, cell phone usage can harm a person' s health. Brain cancer rates in the US have risen smce cell phones were introduced, leading some people to wonder if cell phone usage is the reason for the increase.

　　In recognition of those above, there should be some kind of regulations helping with this problem. This way people will be well aware.