地铁：subway， 公交车：bus， 轻轨：light rail， 火车：train

　　必杀短语：

　　对环境有好处 ：benefits the environment

　　私家车的坏处：

　　成本高： be far more costly than  xxx

　　注册费：registration fee，

　　维修费：maintenance cost

　　油费：gas money

　　保险费用：insurance

　　排放尾气 ：pollute the air and emit greenhouse gas

　　占用空间： take up a lot of valuable space

　　本可以用来： could have been used for other purpose, building a library, garden, park or playground for the kids

　　制造噪音： create lots of noise

　　出彩的句子：

　　如果政府鼓励大家使用公交的话，这会降低“交通”水平, 会减少交通拥堵 。

　　If government encourages the use of public transportation, it will decrease the level of traffic and reduce the chance to get stuck on the road.

　　虚拟语气：

　　如果坐公交的话不需要担心自己开车到处找个地方停车或者加油。

　　You do not have to worry about finding a place to park or filling up the gas like you would if you drove your own vehicle.

　　真题演练：

　　Some people prefer to 有自己的车, other prefer to mainly use 公共交通. Which do you agree with? Explain why.