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题目
题型:不详难度:来源:
They were trying to remove harmful ______ from cigarettes.
A.contentB.substancesC.materialsD.mixtures

答案
B
解析
此处意思:物质,物体,B项有此意。
核心考点
试题【 They were trying to remove harmful ______ from cigarettes.A.contentB.substances】;主要考察你对名词等知识点的理解。[详细]
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