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picture a is not worked,and picture b is worked,now,let's look at the contrast between a and b(worked,adj.处理过的)
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上: As technology develops, moro and more people are buying cars. However, this causes a problem: there are too many cars on the road and it's very easy to fet into a traffic jam.下:Because there are too many cars on the road and some of the drivers don't follow the traffic rules, serious traffic accidents may happen. Lots of cars hit each other make a big mess解决:We can see that too many cars on t he road can cause serious problems. We should use cars less and instead, walk and ride bicycles more.
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