精选优质文档-倾情为你奉上2012级第3学期口语考试题签1Key words and expressions:air pollutionsustainable developmentclassified rubbishplant treesvehiclePicture 1In order to make the earth happy all the time, we should try our best to reduce the air pollution. It can be seen from the picture that in order to reduce the air pollution, we can do the following things. Firstly, plant trees to absorb the harmful air. Secondly, do our best to classify the rubbish. Thirdly, go out by bike i
