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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1.Where does the story happen?

A In Sweden.

B In Senegal.

C In Singapore.

D In Switzerland.

解析：选A。A细节理解题。根据第一段“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.”可知，该事件发生在Sweden(瑞典)。故选A。

2._________ bring(s) Swedish cities problems.

A Birds

B A company

C Swedish people

D Smokers

解析：选D。D推理判断题。根据第一段可知瑞典吸烟者经常把烟蒂丢在地上，这带来了一个烟蒂清理问题，据说瑞典的一个城市每年要花220万美元来清理，即吸烟者乱丢烟蒂造成了该局面，故选D。

3.What may crows get if they put cigarette butts in the special box?

A Clothes.

B Boxes.

C Bread.

D Money.

解析：选C。C细节理解题。根据第二段“The company makes a special box. Birds put cigarette butts in it. Then the birds can get some food.”可知这家公司制造了一种特殊的盒子。鸟把烟蒂放在里面。然后他们可以得到一些食物，故它们可能会得到面包。故选C。

4.Which word can be put in _________?

A cute

B smart

C lovely

D boring

解析：选B。B推理判断题。根据第三段“They learn from each other. They know how to clean the streets.”可知这些乌鸦相互学习，它们知道如何清理街道，即它们非常“聪明”。故选B。

5.To keep the streets clean, the writer thinks that _________?

A more birds should come to help

B people should stop selling cigarettes

C should stop smoking from now on

D people should leave cigareete butts in the right place

解析：选D。D细节理解题。根据最后一句“However, the best idea is still not to leave cigarette butts on the ground.”可知作者认为最好的方法还是不要把烟蒂丢到地上，即应该把烟蒂丢在正确的地方，故选D。