A. TELLING B. SAYING C. PHONING D. DESCRIBINGIX. READ THE FOLLOWIN...

27. A. telling B. saying C. phoning D. describingIX. Read the following passage and mark the letter A, B, C or D to indicate thecorrect answer to each of the questions.Smog is a combination of smoke and fog It occurs when gases from burnt fuel mixwith fog on the ground. When heat and sunlight get together with these gases, they formfine, dangerous particles in the air.Smog occurs in big cities with a lot of traffic. Particularly, in the summertime,when it is very hot, smog stays near the ground. It is dangerous to our breathing, and insmoggy areas, we cannot see very well.Smog was first discovered in Great Britain in the 19th century, during thebeginning of the Industrial Revolution. At that time, people used coal for heating andcooking. Factories also used coal to produce iron and steel. Smoke mixed with wet, foggyair and turned yellow. The smog often hung over cities for many days. It caused lungdiseases and breathing problem. Thousands of people died in London every year.Today, cities that have a large population and are located in hot, subtropical areashave the biggest smog problems - for example, Los Angeles, Mexico City and Cairo.