Hundreds of years ago, life was much harder and simpler than it is today. People didn’t have m 25 machines.
Life today has brought new p 26 . One of the biggest is pollution. Water pollution has made our rivers and lakes d 27 . It kills fish and affects drinking water. Noise pollution makes us talk louder and become angry more e 28 . Air pollution is the most serious kind of pollution. It affects m 29 living things in the world.
Cars, planes and factories a 30 pollute the air. To solve the problem, many countries are making laws to fight the pollution. Factories must clean their water b 31 it is thrown away. They mustn’t discharge (排出) dirty smoke into the air.
We need to do many o 32 things. We can put waste things in dustbins and should not throw them on the ground. We can go to work by bus or share the same car with our friends. If there are fewer people driving, there will be less a 33 pollution.
Laws are not e 34 . Every person must help reduce the pollution.