Câu hỏi 21. Environmental pollution is a term that (21) …………… to all the ways by which man pollutes his surroundings, Man dirties the air with gases and smoke,(22)…….the water with chemicals and other substances, and damages the soil with (23) ………….. many fertilizers and pesticides. Man also pollutes his surroundings (24)………….various other ways.(25)………..,people run natural beauty by scattering little on the land and in the water .They operate machines and motor vehicles that fill the air with disturbing (26)…….. pollution. Environmental pollution (27)…….. one of the most serious (28)…….. facing mankind today. Air, (29)…….., and soil are necessary to the survival of all living things. Badly- polluted air can cause illness, and (30)……….death. Polluted water kills fish and other marine life. Pollution of soil reduces the amount of land for growing food. Environmental pollution also brings ugliness to man’s natural beautiful world.