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The human skin forms ______against the action of physical, chemical, and bacteri
The human skin forms ______against the action of physical, chemical, and bacteri
游客
2024-01-05
49
管理
问题
The human skin forms ______against the action of physical, chemical, and bacterial agents on the deeper tissues.
选项
A、how protective a barrier is
B、a protective barrier
C、a barrier protects
D、and which a barrier protects
答案
B
解析
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