题目

I was not a confident（自信的）girl before. I _______spoke in front of the class because I was afraid of making mistakes. My family went to Mount Tai last summer holiday. Something important _______there and it changed me greatly.We _______the foot of Mount Tai early in the morning and began to climb. Soon all of us felt tired _______the stairs were really steep(陡峭的). An hour late, we stopped to have a rest. While we were having a rest, my mother changed her _______and decided not to climb any more. I couldn’t decide whether to stay there or go on_______with my father. “'No matt假设某雌性动物的体细胞内有4条染色体，其基因型为MMNn。下图为该生物个体的细胞分裂示意图，下列相关叙述错误的是( )A.图中只有①细胞含有4个染色体组，图③是有丝分裂中期图B.基因的分离定律和自由组合定律均可发生在图②所示的细胞中C.图④细胞只能表示第一极体，出现MmNN基因组成是交叉互换的结果D.该雌性动物发生的变异为基因重组和基因突变