A:哺乳动物成熟的红细胞无细胞核,利于血红蛋白携带氧
B:叶绿体内类囊体膜堆叠使膜面积增大,利于光能充分利用
C:低等植物细胞中心体的存在,利于其有丝分裂的正常进行
D:癌细胞膜上糖蛋白减少,促使细胞分散和无限增殖
下图为反映中国民族资本主义发展进程的数据表。I阶段发展趋势表明了( )
Tomorrow is Sunday . Sally will go to the park 1her best friend , Amy . The bus stop is 2her home .So Sally will 3to the bus stop and take the No.2 bus 4 Amy's home ;5they will go to the park on 6,7the park is near Amy's home .They will play chess 8the tree. They will 9 pictures and watch the beautiful flowers ,10