◎ 题干
The skin, an ____ part of your body and its largest organ, ____ as a barrier against diseases.
[     ]
A. vital, acting  
B. vital, acts    
C. essential, acting  
D. essential, acts
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“The skin, an ____ part of your body and its largest organ, ____ as a barrier against diseases.[ ]A. vital, acting B. vital, acts C. essential, acting D. ess…”主要考查了你对  【形容词】【一般现在时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。