2Aging 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(1), B(0), C(0), D(0), E(0) #3466625

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#6735084
題目解析 這道題目考察的是皮膚老化的原因...
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