【正文】
、自制課件、照片等 教學(xué)過(guò)程: StepⅠ Warm up and revision(熱身與復(fù)習(xí)) 1. Greetings. 2. Guessing game. Step Ⅱ Presentation and practice (自主探究) T: Please write the meanings on your paper air______ smoke ______ factory ________ dirty________ clean ______ alive _________ everywhe