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在写议论文时，你通常以什么样的方式开头呢?最简单也最常用的可能就是开门见山法。也就是说——直截了当地提出你对这个问题的观点，点出文章的中心思想。

I....has both advantages and disadvantages.……既有利又有弊。例如：

1.Obviously television has both advantages and disadvantages.

2.Living in a city has both advantages and disadvantages.

3.Compared with cars，bikes have their advantages and disadvantages.

举一反三：

1.Although computers bring people a lot of convenience，they have many disadvantages.

2....has many advantages.For example，...However，just as every coin has two sides，...has its disadvantages.(本例将利弊分开讲，转折过渡自然。just as every coin has two sides也很值得背诵。)

II....play(s)an important role /part in...……在……中扮演重要角色/起重要作用。例如：

1.Computers play an important role in science and technology.

2.Computers play a more and more important role in our

life.

Computers play an increasingly important role in our studies.

3.Education plays an important part in developing our mind.

4.Addiction to alcohol and drugs play a role in homelessness.

举一反三：

1.Advertisement plays an informative role in our daily life.

2.In the past，letters played a decisive role in long-distance communication.But now ，telephone，email，fax have taken their place.

III.With the development of...，随着……的发展，例如：

1.With the development of our economy，m any Chinese families can afford a car.

2.With the development of our economy and society，pollution is more and more serious.

3.With the rapid development of science and technology，people can get a college degree by taking online-courses at home.

4.With the current social and technological developments，employees with more knowledge and higher academic degrees are needed.

举一反三：

1.With the rapid increase of China's population，housing problem is becoming more and more serious.

随着中国人口的急剧增加，住房问题越来越突出。

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