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.
本时文内容由奇速英语国际教育研究院原创编写，未经书面授权，禁止复制和任何商业用途，版权所有，侵权必究！（作者投稿及时文阅读定制请联系微信：18980471698）
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