PULLUTION
　　The world population is growing very fast. More food, clothing, houses are needed. Agriculture and industry, therefore, have to develop very quickly。
　　Unfortunately; modem farming and industry are making the air, the soil, and the water dirty, which we called pollution. Pollution is a serious danger to human lives. For example; throughout the world air pollution is serious in all cities. It is said that every year factories pour millions of tons of smoke into the air, and， air pollution has taken the lives of many people. Scientists are now fighting a battle against pollution.
　　So far, it has been successful. Of course, the battle cannot be won unless every one of us understands the danger of pollution and does something to stop it.