Most Americans would find it hard to think that what life【小题1】would look like without a ca

Most Americans would find it hard to think that what life 【小题1】
would look like without a car. But, some have realized 【小题2】
the serious question of the pollution caused by the car. 【小题3】
The polluted air becomes harmful and dangerous to health 【小题4】
One way to getting rid of the polluted air is to build a 【小题5】
car that doesn’t cause pollution. That is how several of the 【小题6】
large car factories have been tried to do. But to build 【小题7】
a clean car is more easier said than done. Progress in this 【小题8】
field has been slow.
Another way is to take place of the car engine by a 【小题9】
steam one. Inventors are now working on steam cars as well as
electric cars. Many makers believe that it will spend 【小题10】
years to develop a practical model that pleased people去掉that

(答案→)去掉that 解析： 略

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