2. 外语
  3. The human skin forms ______against the action of physical, chemical, and bacterial agents on the deeper tissues.

The human skin forms ______against the action of physical, chemical, and bacterial agents on the deeper tissues.

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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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