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The heart is a(n)       organ,  It is of absolute  importance to our body and life.

A.vitalB.energeticC.livingD.lively

A

解析试题分析:A.vital至关重要的,B. energetic 精力充沛的,C. living活着的,D. lively生动的,句意:心脏是 至关重要的器官,对我们的身体和生活绝对重要。所以选A。
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