题目

听下面一段较长对话，回答以下小题。【1】What are the two speakers talking about?A. Air pollution. B. Transportation. C. Road connection.【2】Why does the man think laws of car use will be made?A. Because road traffic has to be controlled.B. Because there‟ll be new ways of travelling.C. Because too many people enjoy air travel.【3】What does the woman think of travelling by train under the ocean?A. It is exciting. B. It is frightening. C. It is unimaginable.19．近年来我市空气质量有所下降，下列不属于空气污染物的是（　　）A．COB．NO2C．CO2D．SO2