Lesson 47 Too high a price 代价是否太高New words and expression 生词和短语pollution n.污染相应词型: pollute, polluted, pollution, polluterair pollution water pollution noise pollution information pollutionpollutant n.污染物 chemical pollutant pollute v.污染More and more water is been polluted.Pollution is the major problem we are faced with.Gases from cars are one of the polluters of air pollution.eg. Peking is heavily polluted. pollute ones mind 污染心灵polluter A polluter
