A. Read and fill in the blank with a suitable word from the given ones. poured - serious - gradually - threatens - for Air pollution is a (1) ______________problem in many cities. Motor vehicles, factories and other sources create so much air pollution that may hang in the air like dirty fog. Air pollution (2)________________ the health of the people who live in the cities . City wastes cause water pollution when they are (3) ____________ into water ways. These wastes kill fish and make some areas unfit (4)____________ swimming . In addition , many large cities have difficulties in disposing of their garbage. The amount of garbage grows each year, but places to put it are filling up. Citizens, governments. industries , scientists and business people must work together in different ways to (5) ________________ reduce pollution. For example, most have introduced recycling programmes.Trình đọc Chân thực