A. NUMBER B. AMOUNT C. SPEED D. SOURCE AIR POLLUTION IS A CAUSE O...
7. A. number B. amount C. speed D. source Air pollution is a cause of ill health in (1) ………… In many countries, there are laws limiting the amount of smoke that factories can produce. Although there isn’t (2) ………. on the (3)………… of smoke in the atmosphere, doctors have proved that air pollution causes lung diseases. The gar from the exhausts of car have also (4) ………… air pollution in (5) ………… cities. The(6) ………… in petrol produces a poisonous gas that often collects in busy street surrounded by high buildings. Children (7) ………… live in areas where there is a lot of lead in the atmosphere can’t think as (8) ………. as other children and are clumsy when they use their hands. There are other long-term effects of pollution. If the gases in the atmosphere continue (9) ………… increase, the earth’s climate may become warmer. A lot of ice near the Poles may (10) ………… and may cause serious floods.