题目

---- ______ he dropped out of school? ----His family had run into financial difficulties. A. Why was it that              B. Why was that    C. Why was that it              D. Why was it 答案：A下列关于细胞分裂的叙述，错误的是：A.细胞分裂使细胞数目增加 B.细胞分裂与多细胞生物由小长大有关 C.动物细胞与植物细胞的分裂过程一样 D.细胞分裂时染色体先进行复制后平均分配