英语周报七年级2018~2022答案

Li HI第二节The next day when i arrived at school. I didn't findAlice. I felt everything was very dark. I had a bad feelingwhen I was looking for her. I found some guys werebothering Alice, and this time they were hitting her andpulling her hair. I heard one of the guys say, "You have togive me all your homework, or we'll keep on hitting youI did not know what to do. I was very worried, so mydecision was to call the policeWhen the police arrived, the guys who were bullyingAlice were caught. We all had to go to the school office. Iwas in the office as a witness. Alice was a victim, andhose who bullied her were guilty. When my parentsarrived, theyfelt piroud of me. Alice told her parenteverything. She was extremely grateful and kept thankingme. From that day on, I got a best friend for life, andAlice learned how to defend herself

22.B【解析】在杂合体连续自交过程中,纯合体逐渐增多,杂合体逐渐减少,基因型頻率每一代都不样,A项错误;由于题目中没有涉及环境的选择作用,两个区域植株分别种植,种群基因频率不变,B项正确,两区域间只存在地理隔离,没有形成生殖隔离,C项错误;题中没有涉及自然选择,D项错误

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