4. Unfortunately, coal causes serious air pollu- tion and increases global warming.
A. bum B. burning
C. burned D. burns
4. B解析:此句缺少主语，故用动名词作 句子的主语。
题目来源：2016年周测月考直通高考高中英语必修3外研版 > 周内课时练21 Period One Introduction & Reading and Vocabulary—Comprehension
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