英语周报2020—2021九年级十一期答案

、写作(共两节,满分35分)第一节短文改错(共10小题;每小题1分,满分10分)Last Saturday, my classmates and I went to the Chinese Academy of Sciences, what was aprecious chance to get closely to science. The moment whan we arrived there, we were warmlygreeted by an expert stood at the entrance. To have A better understanding of daily basic science,standingwe first attend a professional lecture on the theme of life and Water. The highlight of the visitattendedvere the hands-on experience in the science lab Under the guidances of the expert, we gotinvolved in a medical experiment with great enthusiasm Through the meaningful activity we allagree science plays an important role in our life. We are determining to study hard to understanddeterminedthem

答案】D【解析】根据题意可知,精原包胞经过减数第一次分裂的同期形成初级精胞,在网DNA复制1次,每条染色体中只有1条色体单体被标记,A项:次精母细胞或数裂后期着丝点分裂,姐妹染色草体公后形成的子染色体只有一半被标记,B项误:方有色体中,被标记的染色体数与未被标记的染色体数相等,但不是说半数精细胞中有被标体,也可能是全部的精细胞中有被标记的染色体,C项错误、D项正确体内的S用”s标记,P用P标记,用该噬菌体去侵染未标记的细菌后,产生许多子代噬菌子代噬菌体中”S和”P的分布

以上就是英语周报2020—2021九年级十一期答案，更多英语周报答案请关注本网站。