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题库 / Prep2007E1-SC-23
While they remove carbon dioxide from the air, conserve soil and water, and house thousands of species, forests also supply potentially valuable pharmaceuticals, and, as sources of building material and firewood, that provide employment for millions worldwide.
pharmaceuticals, and, as sources of building material and firewood, that provide
pharmaceuticals, and sources of building material and firewood, are providers of
pharmaceuticals and, as sources of building material and firewood that are providing
pharmaceuticals and sources of building material and firewood, for providing
pharmaceuticals and, as sources of building material and firewood, provide
还没有题目讲解（毕出老师会陆续发布对官方考题的解读，请保持关注）。
做题时考虑的是并列层次，E只有提供燃料和房屋材料时，才会增加就业，提供药材时不会；D提供药材和燃料、房屋材料时，都会增加就业。
然鹅
D，forests supply sources of building material and firewood，sources是来源的意思，不能供应来源，
E，forests provide employment as sources of building material and firewood，森林作为建筑材料和燃料的来源提供了就业，对！
所以还是选E
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