AIR POLLUTION

Air pollution is a cause of ill-health in human beings. In a lot of countries, there are laws limiting the amount of smoke which factories can produce. (25) _____________ there isn’t enough information on the effects of smoke in the atmosphere, doctors have proved that air pollution (26) _____________ lung diseases.

The gases from the exhausts of cars have also increased air pollution in most cities. The lead in petrol produces a (27) _____________ gas which often collects in busy streets surrounded by high buildings. Children (28) _____________ live in areas where there is a lot of lead in the atmosphere cannot think as quickly as other children and are clumsy when they use their hands.

There are other long-term effects of pollution. If the gases (29) _____________ the atmosphere continue to increase, the earth’s climate may become warmer. A lot of the ice near the Pole may melt and may cause serious (30) _____________.

25. A. However        B. Although                C. Therefore                D. Because

26. A. gets                B. docs                        C. makes                D. causes

27. A. dead                B. powerful                C. poisonous                D. harmless

28. A. when                B. which                C. where                D. who

29. A. in                B. on                        C. over                        D. up

30. A. flood                B. storm                C. earthquake                D. volcano

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