22.C【解析】某些单倍体植株(如二倍体植株的花粉形成的单倍体)在进行有丝分裂过程中,不存在同源染色体;有丝分裂只能发生在真核细胞中,大肠杆菌为原核生物,不进行有丝分裂;蛙的红细胞进行无丝分裂,分裂过程中没有出现纺锤丝和染色体的变化;减数分裂过程中有非同源染色体的自由组合,而受精作用没有故选C。

Writing 10Dear Jim,Knowing that you'll take part in the "Studying inChina"speech contest. I'm writing to give you somepractical suggestions at your requestI recommend that you talk about the courses onChinese traditional culture that you ve attended. The majorreason is that they introduce the real treasure in humanhistory. Besides, since you've taken the coursessystematically, you re sure to have a deep understandingof them. To do it well I think you should chooseimpressive examples to gain the recognition of the judges.Moreover, you have to practise your spoken Chinese teexpress yoursIf more clearly and fluently. Speaking skillsare also needed, for they can help maximize theeffectiveness of your speechi do hope my advice will be of some help to you. Wishyou great successoursLi h

以上就是2021-2022 英语周报 七年级 新目标实验 59答案，更多英语周报答案请关注本网站。

本文地址： http://www.ncneedu.cn/post/17954.html

文章来源：admin

版权声明：除非特别标注，否则均为本站原创文章，转载时请以链接形式注明文章出处。