题目内容：

    When your pen is broken, the battery in your toy runs out, or you have some leftover food. What do you do with these things? You will probably throw them all into one bin. But actually, all of these pieces of trash need to be sorted separately. In recent years, some Chinese cities have been working hard on it.

Shanghai has worked with Alipay to create a“ green account(绿色账户)”service for people. Account holders get points by correctly sorting their garbage. Through the Alipay app, they can exchange the points for milk, phone cards and other products. The city is asking all of its people to sort their garbage into four groups: wet, recyclable, harmful and dry.

Wet waste is also known as household waste. “They are things you don’t want but that pigs can eat,” Guangzhou Daily explained.

Paper, metal, glass and other things that can be reused are recyclable waste.

Harmful waste includes things like medicine batteries and fluorescent bulbs(荧光灯泡).

Finally, any waste that’s not wet, recyclable or harmful will go in the “dry waste” bin.

Many other Chinese cities are also using this method to sort their garbage. For example, Shenzhen has been sorting its garbage into the same four groups since 2012. Students there also receive waste-sorting guidebooks that they must study.

China is improving its waste-sorting efforts. There is still a long way to go. But it’s never too late to learn how to sort your trash properly and protect the environment.

If you don’t sort your garbage, all of it will go to a landfill and be buried together. These landfills can take up large areas of ground that could have been used for planting trees or crops. The electronic waste you throw away, such as batteries, can pollute the soil and groundwater. Other pieces of garbage, like the metal part of a pen, can be used to make other things if they are properly recycled.

根据材料内容选出最佳答案。

1.How is Shanghai encouraging people to sort their garbage?

A.By paying people to sort their trash correctly.

B.By providing its people with guidebooks to help them.

C.By allowing people to exchange garbage with each other.

D.By creating a “green account” service with the help of Alipay.

2.Which of the following would be sorted as wet waste?

A. B. C. D.

3.What does the underlined word “landfill” mean?

A.里程碑 B.地下水 C.填埋场 D.风景区

4.What do we know about garbage sorting in China?

A.It started its garbage sorting system in 2012.

B.There is still a lot of work to be done in this area.

C.Landfills are a great method of dealing with garbage.

D.Students have to take waste-sorting classes in school.

5.What is the main idea of the last paragraph?

A.Where we can deal with our waste.

B.Why we should sort our garbage properly.

C.What kinds of waste can pollute the environment.

D.How some kinds of waste can be reused and recycled.