短文改错（共10小题；每小题1.5分，满分15分 ）
此题要求对一段文章改错。先对每一行做出判断是对还是错。如果是对的，在该行右边横线上画一个勾（√）；如果有错误（每行不会多于一个错误 ），则按情况改错如下：
此行多一个词，把多余的词用斜线（﹨）划掉，在该行右边横线上写出该词，并也用斜线划掉。
此行缺一个词，在缺词处加一个漏字符号（∧），在该行右边横线上写出该加的词。
此行错一个词，在错的词下划一横线，在该行右边横线上写出改正后的词。
注意：原行没有错的不要改。
Most Americans would find it hard to think that what life   ____________
would look like without a car. But, some have realized     _______ ____
the serious question of the pollution caused by the car.   ____ ________
The polluted air becomes harmful and dangerous to health.   ___ ________
One way to getting rid of the polluted air is to build a   ____________
car that doesn’t cause pollution. That is how several of the   ____  ______
large car factories have been tried to do. But to build        _________   
a clean car is more easier said than done. Progress in this   _________   
field has been slow.
Another way is to take place of the car engine by a      ___________ 
steam one. Inventors are now working on steam cars as well as
electric cars. Many makers believe that it will spend          __________  
years to develop a practical model that pleased people.