Unit 3 Enviroment 环境
Conversations3

Hints:
smog
Mr. Brown and his son Robert are walking along the river. Dad, how foggy it is this morning. Yes, it's a new problem. A new problem? Why do you say so? The problem results from smog. Smog? What is it? Smog is blended with two words – smoke and fog. It has seriously affected people more than any other type of air pollution. I see. Look, there are some plastic bags floating on the river. Some citizens are still ignorant of the environmental protection. It's really a pity. But anyway, public concern over the environmental pollution has greatly increased. There is hope for the future.