题目内容：
当人的皮肤受到阳光照射时，便会在体内产生（ ）。 A.维生素A B.维生素B C.维生素C D.维生素D
参考答案：
答案解析：
选择题：当人的皮肤受到阳光照射时，便会在体内产生（ ）。A.维生素A B.维生素B C.维生素C D.维生素D
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