题目内容
They were trying to remove harmful ______ from cigarettes.
A. content B. substances C. materials D. mixtures
B
解析:
此处意思:物质,物体,B项有此意。
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题目内容
They were trying to remove harmful ______ from cigarettes.
A. content B. substances C. materials D. mixtures
B
此处意思:物质,物体,B项有此意。