题目

He watched TV for an hour. At 8 o’clock he stopped _______ his homework.    A. do      B. doing        C. to do       D. did 答案：C对下列有关细胞分裂的各图分析正确的是                            (　　) A.甲、乙两图所示细胞中都有2个染色体组  B.甲、乙两图对应丁图中的CD段 C.甲图可能是卵原细胞的增殖              D.丙图中染色体与DNA的比是2∶1