Our globe is in danger!在整堂课的教学中，刘教师总是让学生带着问题来学习，而问题的设置具有一定的梯度，由浅入深，所提出的问题也很明确The environmental problems!v Sandstormv Water pollutionv Deforestationv Air pollutionv Droughtv Litteringv Light pollutionv Desertificationv Melting polar ice cap在整堂课的教学中，刘教师总是让学生带着问题来学习，而问题的设置具有一定的梯度，由浅入深，所提出的问题也很明确Sandstormv AS far as chen guang( 陈光)is concerned,v the reason why sandstorms strike us so often are as follows: v Firstly,to build house and grow more crops,people cut down more and more trees every year.v S
