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Most Americans would find it hard to think that what life 1.____________
would look like without a car. But, some have realized 2. _______ ____
the serious question of the pollution caused by the car. 3. ____ ________
The polluted air becomes harmful and dangerous to health. 4. ___ ________
One way to getting rid of the polluted air is to build a 5.___ _________
car that doesn¡¯t cause pollution. That is how several of the 6. ____ ______
large car factories have been tried to do. But to build 7. _________
a clean car is more easier said than done. Progress in this 8._________
field has been slow.
Another way is to take place of the car engine by a 9. ___________
steam one. Inventors are now working on steam cars as well as
electric cars. Many makers believe that it will spend 10. __________
years to develop a practical model that pleased people.
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4..¡Å 5.getting¡úget 6.how¡úwhat
7..tried¡útrying 8.È¥µômore 9.takeºÍplaceÖ®¼ä¼Óthe
10. spend¡ú take
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