题目

有丝分裂、减数分裂过程中具有一些共同的特点。下列属于其共同特点的是     ①纺锤体形成   ②着丝点分裂  ③联会   ④出现四分体   ⑤DNA复制 A．①②③⑤            B．①②⑤                C．②③④⑤            D．①②③④⑤ 答案：B请根据要求改写下列句子，每空一词。1.My mother does the housework in my family.（改为否定句）My mother______the housework in my family.2.Shall we visit the Great Wall this Sunday？（保持句意基本不变）How________the Great Wall this Sunday？3.They often chat with each other in the playground.（用 now代替often改写句子）They_________with each other in the playground now.4.There are some white shirts on the bed.（改为一般疑问句）____there_____white shirts on the bed？5.The girl in front of the classroom building is my sister。（对划线部分提问）_______is your sister？