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题目内容
（佳木斯大学语言治疗学）
Recycling means _____________ .
·extracting useful materials from natural materials
·extracting useful materials from waste materials
·selling waste materials to earmoney
·making profits by selling water materials
·extracting useful materials from natural materials
·extracting useful materials from waste materials
·selling waste materials to earmoney
·making profits by selling water materials
参考答案
