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

环境保护是我国基本国策之一，环境保护问题愈来愈引起人们的重视。完成下列各题。

小题1:当前传统的塑料包装被纸包装所代替，下述观点是对其原因的说明，其中正确的是（  ）

A．纸包装比塑料包装便宜

B．纸包装比塑料包装美观便宜

C．纸的主要成分是天然植物纤维素，容易被土壤微生物分解

D．纸包装比塑料包装轻便小题2:实现汽油无铅化是保护环境的重大举措，近年来我国禁止使用含铅汽油，主要原因（  ）

A．降低汽油成本

B．节约铅金属

C．避免铅污染大气

D．含铅汽油燃烧效率低小题3:根据国务院的指示精神，车用汽油醇已于2001年6月开始在河南、吉林、黑龙江三省定点使用，为全国使用汽油醇这一战略措施积累了经验。车用汽油醇是使用小麦、玉米等原料生产的变性乙醇和汽油按一定的比例混合而成的新型燃料，是国际公认的清洁燃料。我国之所以率先在上述三省试用乙醇汽油，主要考虑这三省是（  ）

A．农业大省

B．小麦、玉米生产基地且产粮较多

C．汽油拥有量大

D．人口众多