People around the world use plastic bags for water, food and other uses.They are ligh and useful. However, these plastics can pollute water and the environment. Plastic waste is a real problem in many poor countries. But an African country is taking actions for it.

Hundreds of people in the capital of Uganda, Kampala, have already begun to collect waste plastics. David Kibande is one of the people who help collect plastic waste in the Ugandan capital. He supervises about 10 other collectors. He and the other workers collect up to 10 tons of plastic waste a week. They sell what they collect for about seven U.S. cents per kilogram. Mr. Kibande says they would not have a job otherwise. They are able to make a living while helping to clean up the city.

A private factory is helping with Uganda's plastic problems. It asks people like David Kibande to collect plastic waste for them. The factory recycles 650 kilograms of plastic every hour. More than 3 million kilograms of plastic are recycled each year. 

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1.What does the underlined word “they” refer to?

A People

B Plastic bags

C Food

D Water

解析：选B。B 推理判断题。根据文章第一段的第一句可知，世界各地，人们都使用塑料袋装食物、水或其他东西，它们又轻便又实用，因此推断这里they是指塑料袋。故答案为B。

2.Uganda may be a country in ____________.

A Asia

B America

C Africa

D Australia

解析：选C。C 细节理解题。根据文章第一段的最后一句“But an African country is taking actions for it.”可知，一个非洲国家在采取行动，Uganda就是这个非洲国家，故答案为C。

3.How do David Kibande and his workers make a living?

A By working in a factory.

B By cleaning up the city.

C By working on a farm.

D By collecting plastic waste.

解析：选D。D 推理判断题。根据文章第三段的内容可知，David Kibande和他的工人们没有其他工作，就是收集废旧塑料来卖钱为生，同时也帮助打扫了城市，他们的钱来自卖废旧塑料，而不是打扫卫生。故答案为D。

4.How much plastic does the factory recycle each year?

A 10 tons.

B 650 kilograms.

C More than 3 million kilograms.

D More than 650 million kilograms.

解析：选C。C 细节理解题。根据文章第三段的最后一句“More than 3 million kilograms of plastic are recycled each year.”可知，答案为C。