The heart is a(n) organ, It is of absolute importance to our body and life.
A. vital
B. energetic
C. living
D. lively
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(答案→)A. vital
B. energetic
C. living
D. lively
解析: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。