2. Aging of skin is caused by _____ factors, which include ultra-violet radiation and air pollution.
(A) external
(B) nocturnal
(C) empirical
(D) internal

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統計： A(4), B(1), C(0), D(0), E(0) #3451306

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#6729233
1. 題目解析 本題旨在考察考生對於皮膚...
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