1. New words and phrases
沙尘暴_________沙丘_________ 沙漠化____________
沙尘 _____ 大气层__________ 废料_________ Mass_________ campaign _________ process ________ citizen ________forecast _________ Pollution ______ 化学药品________ 环境___________ 力量_______ 重新利用___________ Concerned