2022-2022英语双语周报七上答案

第二节书面表达One possible versionDear sir/madamI am delighted to know the International Book Fair willbe held next week in our city and that some volunteers areneeded. I am writing to recommend myselfThe following are my advantages. First of all, I speakEnglish so fluently that I have no difficulty communicatingwith foreigners. Secondly, as a monitor, i always organizeall kinds of activities, which allows me to get along wellwith others. More importantly, I am a registered volunteer,so I have gained rich experience in volunteering. Irn aword,hink i am equal to the volunteer jobI would appreciate it if i were given a chance. Lookingforward to your early replyYours.Li hua

4.【答案】C解析】在减数分裂过程中,减数第一次分裂出现同源染色体分离现象,所以染色体数目减半发生在减数第一次分裂时期,A正确:四分体中发生的非姐妹染色单体间的交叉互换,增加了配子的多样性,即增加了后代的遗传多样性,B正确:蝗虫是比较好的观察减数分裂的动物材料,但雌蝗虫的卵巢内卵细胞数量少,一般不使用卵巢切片,而是用雄蝗虫的精巢切片观察,C镨误:可以通过建构物理模型模拟减数分裂中的染色体变化,D正确

以上就是2022-2022英语双语周报七上答案，更多英语周报答案请关注本网站。