【题目】Let's protect our earth! In 3R rules, is the most important. ( )
A.reusingB.recyclingC.reducing
【答案】C
【解析】
句意：让我们保护地球吧！在3R规则中，减少是最重要的。A重复使用，B回收利用，C减少。根据常识可知在3R规则中，减少是最重要的，故选C。
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