题目内容
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
D
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题目内容
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
D