动物细胞培养的特点是
①细胞贴壁 ②有丝分裂 ③分散生长 ④接触抑制 ⑤减数分裂[ ]
A．①②④
B．②④⑤
C．①③④
D．③④⑤
答案：A
—What do you do _______ Mid-autumn Day?
—We usually eat a big dinner and moon cakes in the open air. [ ]
A. to
B. in
C. at
D. on
波分系统中网管通过开销字节监控各个网元。（）
