① 细胞核分裂成两个                    

② 在细胞中央形成新的细胞膜和细胞壁

③ 细胞质分成两份，各含一个细胞核

设U为全集，对集合X，Y，定义运算“*”，X*Y=（X∩Y）．对于任意集合X，Y，Z，则（ X*Y ）*Z=（　　）

    Hello! 1 name is Li Ying. I'm twelve. I'm from Zhaoqing. Now I'm in Zhaoqing No.4 Middle School. I'm 2Class Five, Grade Seven. Miss Gao 3 my English teacher. She is 4 old teacher. I have(有) a pen, a ruler and two 5 in my pencil-box(文具盒). Liu Ping is in Grade Seven, too. 6 is from Guangzhou. She is my good 7. Her 8 is 020-7198630. Now she can 9 English well(好). I think(认为) she is a good girl. Look！10is that? She is Liu Ping.

百年大计，教育为本。教育决定一个国家和民族的未来，寄托着亿万家庭对美好生活的期盼，强国必先强教。上述材料强调了（    ）