Air pollution is a (1)_______.of ill-health inhuman beings. In a lot of countries there are laws limiting the amount of smoke which factories can produce. (2)_____there isn’t enough information on the effects(3)_____smoke in the atmosphere, doctors have proved that air pollution causes lung diseases.The gases from the exhausts of cars have also (4)________air pollution in most cities. The lead in petrol produces a poisonous gas which often collects in busy streets surrounded by high buildings. Children who live in areas where there is a lot of lead in the atmosphere cannot think as (5)______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 to increase, the earth’s climate may become warmer. A lot of the ice near the poles may melt and may cause serious floods. 1. A. question B. cause C.damage D. reason 2. A. Although B. However C. But D. Despite 3. A.on B.in C. of D. by 4. A. gone up B. reduced C. risen D. increased 5. A. intelligent B. fastly C. quickly D. quick