填空题

Environmental pollution is a term that refers to ail the ways by which humans pollute their (36) . We also pollute our surroundings in various other ways. People (37) natural beauty by (38) junk and litter on the land and in the water. They operate machines and motor vehicles that fill the air with dangerous (39) and disturbing noise. Environmental pollution is one of the most serious problems that (40) faces today. Air, water, soil are necessary to the (41) of ail living things. Badly polluted air can cause illness and even death. Polluted water kills fish and other marine life. Pollution of the soil (42) the amount of land on which we can (43) food. (44) . Everyone wants to reduce pollution. But the pollution problem is as complicated as it is serious. (45) . For example, exhaust from automobiles causes a large percentage of ail air pollution. But the automobile provides transportation for millions of people. (46) .