問題詳情
20. VitaminD, which the body needs in order to absorb calcium, is produced when skin is exposed toultraviolet rays.
(A) calcium, is produced
(B) calcium, and is produced
(C) calcium, producing it
(D) calcium and produces
(E) calcium and produces it
(A) calcium, is produced
(B) calcium, and is produced
(C) calcium, producing it
(D) calcium and produces
(E) calcium and produces it
參考答案
答案：A
難度：計算中-1
書單：沒有書單，新增
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