（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.Cut off the noise.
（3）What happened in 1967？
A.The EPA was set up.
B.Earth Day was first celebrated.
C.The government of the US passed the Clean Air Act.
（4）What is the EPA's job？
A .To reduce the acid rain.
B.To find out new dangers and reduce them.
C.To help people understand the dangers on the Earth.
（5）How many tips on Earth protection are mentioned in the passage？
A .Four.
B.Five.
C.Six