1. Copy 3 times of Pinyin and Character and make sentences for:
臭氧层、工业、废物、排放、废气, 全球暖化
Write 3 sentences stating the 3 causes of global warming using 导致 and then change them into passive voice using ...由...导致 OR ...是由...导致的
施老师的邮箱：shilaoshizhongwen@gmail.com
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