写一篇议论文.简述乘飞机和乘火车旅行的利弊.词数:150左右.

Air Travel and Train Travel

Air travel has two advantages．First，it can save a lot of time．For example，we can fly from Shenyang to Beijing with①less than an hour，but by train，we have to spend about ten hours to travel②．Secondly，air travel is more comfortable，because the plane flies so smooth③that we can rest well during the trip，when④the train is sometimes crowded and passengers have to sit for a long time，which makes them tired．

However，train travel also has its own advantages For example，traveling by train from Shenyang to Beijing cost⑤less than 2000 yuan，when⑥traveling by plane will cost about 700 yuan．Besides，outside the train's windows，we can enjoy natural scenery．

Of course，different people have different view⑦on traveling，but in my opinion，I prefer to travel by train．

修改：①with→in　介词in表示时间，指“在某段时间内”。

②to travel→traveling　本句使用的是“spend time（in）doing”句型，traveling前省略了in。

③smooth→smoothly　此处应使用副词作状语，修饰动词flies。

④when→while　连词while用以表示对比或相反的情况。

⑤cost→costs　根据上下文，此处应该用动词的一般现在时态；动名词短语作主语时，谓语动词用单数。

⑥when→while　同④。

⑦view→views　此处应该用名词的复数形式。

评点：习作者用充分有力的事实论证了乘飞机和乘火车旅行的利弊，并清楚地表明了自己的观点。短文条理清晰，语义表达清楚，是一篇优秀的作文。