问题
选择题
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. essential, acts
答案
答案：D
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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
答案：D