As we all know, the functions of our skin are very        .
A．complexB．simpleC．briefD．tight
A
考查詞義辨析，complex復(fù)雜的，simple簡單的，brief簡潔的，tight緊的，句意：眾所周知，我們皮膚的功能非常復(fù)雜。故選A。
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