To prevent the wodd from being polluted by cars,we’ll have t。make some changes in the way manv of us live. Americans,for example,have to cut down on the number of their cal's.They are encouraged to travel and go to work by bike.Riding a bike is thought to help keep the air clean.
But this change does not come easily——a large number of workers may find themselves with out jobs if a ear factory closed down.And the problem of air pollution would become less important than that of unemployment(失业).
Ahhough ears have brought US a better life,they have also brought US new problems
6.Some large Car factories in the USA are trying to build a new kind of ear which.
A.is clean in itself
B.is used to clean streets
C.does not pollute the air
D.is easier to make
7.If the number of cars is cut down,the most serious problem to American workers is to_______.
A.have no work to do
B.improve their environment
C.make their factoties richer
D.go to work by bike
8.The writer wants to tell US that_______.
A.riding a bike is the only way out
B.the number of ears must be cut down
C.man won’t live without cars
D.cars bring US not only a better life but also serious problems
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