题目

 —Tom, please tell me        .     —In the Olympic Sports Center. A. where will the match take place          B. where the match will take place C. when will the match take place                D. when the match will take place 答案：B所示的过程，正常情况下在动植物细胞中都不可能发生的是   A．①②              B．③④⑥      C．⑤⑥               D．②④