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外语
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.
admin
2005-01-30
58
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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