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khai21112002
2 năm trước
tổng số dầu ở 3 thùng là 120 lít , biết số dầu ở thùng b bằng tổng số dầu ở hai thùng a và c . nếu chuyển thùng c cho vào thùng a 15 lít thì số dầu lúc này ở thùng a gấp 4 lần số dầu ở thùng c. tính số dầu ở mỗi thùng lúc đầu? GIÚP MÌNH BÀI NÀY ĐI MÌNH ĐANG CẦN GẤP
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Environmental pollution is a term that refers to all the ways by which man pollutes hies surroundings . Man dirties the air with gases and smokes , poisons the water with chemicals and other substances , and damages the soil with too many fertilizers and pesticides . Man also pollutes his surroundings in various other ways . For example , people ruin the natural beauty by scattering junk and litter on the land and in the water . They operate machines and motor vehicles that fill the air with distuibing noise . Environmental pollution is one of the most serious problems facing mankind today . Air , water , and soil are 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 reduces the amount of land that is available for growing food . Environmental pollution also brings ugliness to man's naturally beautiful world 1. How does man pollute the air ? => ................................. 2 . Is water polluted by chemicals and other substances ? => ................................ 3 . How does man damage the soil ? => ............................... 4 . In what way do people ruin the natural beauty ? => .............................. 5 . How harmful is air pollution to people ? => ..............................

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