（1）What problems should we care about according to the passage？
A.Air pollution.
B.Water pollution.
C.Noise pollution.
（2）What should every country do to solve the problems？
A.Rebuild the air.
B.Clean up the air.
C.Produce harmful gases.
（3）How many ways that we can do are mentioned in the passage？
A.Four.
B.Five.
C.Six.
（4）What happened in 1967？
A.The EPA was set up.
B.Earth Day was first celebrated.
C.The government passed the Clean Air Act.
（5）What is the EPA's job？
A.To reduce the acid rain factories produced.
B.To find out new dangers and solve them.
C.To help people understand the dangers on the Earth.