Environmental pollution is a term that refers to all the ways by which humans pollute their 【B1】______. We also pollute our surr

Environmental pollution is a term that refers to all the ways by which humans pollutes their(26)surroundings. We also pollute our surroundings in various other ways. For example, people ruin natural beauty by(27)scattering junk and litter on the land and in the water. They operate machines and motor vehicles that fill the air with dangerous(28)exhaust and disturbing noise.
    Environmental pollution is one of the most serious problems that mankind faces today. Air, water, and soil—all harmed by pollution—are(29)necessary to the survival of all living things. Badly polluted air can cause illness, and even death. Polluted water kills fish and other marine life. Pollution of the soil(30)reduces the amount of land on which we can grow food. Environmental pollution also brings ugliness to man’ s(31)naturally beautiful world.
    Everyone wants to reduce pollution. But the pollution problem is as(32)complicated as it is serious. It is complicated because so much pollution is caused by things which benefit people. For example, exhaust from automobiles causes a large(33)percentage of all air pollution. But the automobile provides transportation for millions of people. Factories discharge much of the material that pollutes air and water, but factories provide jobs for people. Too much fertilizer or pesticide can(34)ruin soil, but fertilizers and pesticides are important aids to the growing of crops. Thus, to end or greatly reduce pollution immediately, people would have to stop(35)using many things that benefit them.