奇速英语

In Sweden, smokers(吸烟者) often leave cigarette butts(烟蒂) on the ground. So many cities have problems with cigarette butts. They are everywhere. People must clean the cigarette butts. The cleaning needs a lot of money. It said that a Swedish city would spend 2.2 million dollars every year on cleaning its streets.

A Swedish company has an idea. Birds will help clean the streets. It will save 75% of the money. The company makes a special box. Birds put cigarette butts in it. Then the birds can get some food.

The birds are crows(乌鸦). They are very _________. They learn from each other. They know how to clean the streets. However, the best idea is still not to leave cigarette butts on the ground.

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