题目

以色列科学家利用胚胎干细胞成功培育出了心肌细胞。依据的原理主要是 A.细胞的生长                    B.细胞的衰老C.细胞的分裂                    D.细胞的分化 答案：D________in the newspaper，I didn’t notice what was happening.A. Having buried B. BuryingC. Buried D. Being buried