Read the following passage and then answer the questions below it

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Exercise 4: Read the following passage and then answer the questions below it.
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. Although there isn't enough
information on the effects of smoke in the atmosphere, doctors have proved that air pollution
causes lung diseases. The gases from the exhausts of cars have also increased 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 quickly as other children and they 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. What can make people sick?
2. Where does smoke come from?
3. Can air pollution cause lung diseases?
4. What else can cause air pollution in cities?
5. Why does the earth's climate become warmer?