CHOOSE THE ITEM ( A, B, C OR D ) THAT BEST ANSWERS THE QUESTION ABOUT THE PASSAGE AIR POLLUTION OCCURS WHEN WASTES DIRTY THE AIR

Exercise 3 : Choose the item ( A, B, C or D ) that best answers the question about the passage

Air pollution occurs when wastes dirty the air. People reduce most of the wastes that cause air

pollution. Such wastes can be in the form of gases or particles of solid or liquid matter. These substances

result chiefly from burning fuel to power motor vehicles and to heat building. Industrial processes and the

burning of garbage also contribute to air pollution . Besides, there are other pollutin substances that exist

naturally in the air. They include dust, pollen , soil particles, and naturally occurring gases.

The rapid growth of population and industry and the increasing use of automobiles and airplanes have

made air pollution a serious problem. The air we breathe has become so filled with pollutants that it can

cause health problems. It also harms plants, animals, building materials, and farbrics.

1. When does air pollution happen ?

A. when wastes are in the form of gases. B. when people produce wastes.

C. when people reduce wastes D. when wastes dirty the air.

2. What does NOT contribute to air pollution ?

A. Industrial processes. B. The burning of garbage

C. The natural existence of oxygen in the air. D. Motor vehicles

3. What are natural pollutants ?

A. pollen B. vehicles C. garbage D. industrial processes.

4. What has made air pollution a serious problem ?

A. the rapid growth of population B. the increasing use of automobiles

C. the rapid growth of industry D. All are correct

5. What does the word “it” in the last sentence refer to ?

A. the polluted air B. the burning material C. the health problem D. the plant and animal