The United States suffered from problems similar to what China is facing today.

　　17

　　The US government finally opened its eyes to the problems and told industries to cut down their polluting emissions（排放）, for which it implemented strict laws requiring clean air and water. All the states in the country follow the regulations, and have added additional requirements that enhance the environmental laws. The end result is cleaner air and water.

　　18

　　The answer: the costs for keeping the environment clean eventually became the burden of the people. The equipment needed to create a healthy lifestyle has been added to the cost of making what we want.

　　The materialistic world that we live in is the cause of most of the pollution. If you wish, you can move away from cities and industrial regions causing the problem.

　　19

　　However, you will soon realize how really small the world is when pollution catches up with us through the wind and rain.

　　It will take time and money to solve the problems the environment faces today.

　　20

　　What the Chinese government should do is to immediately implement strict laws that require clean air and water.

　　A. So who paid for the clean air and water?

　　B. The results left scars on the land, dirty air and water.

　　C. If so, you may escape from the commonly known PM2.5 .

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