2022英语周报八年级24zzy答案

第二节One possible version:I recalled the lad s words. I thought it was time to pay her kindness forward, by buying the twomen a meal and two cups of coffee to thank them for all that they had done. So I paid the bill and wrotedown my blessings as well as"paying it forward"on the back of the bill. The firefighters were confused atfirst, but upon listening to me explaining everything, they accepted my offer pleasantly. After their mealthey left gratefully and joyfullOne of the firefighters posted the picture of the bill online and explained his ex perience in therestaurant. The post has since gained the attention of social media users all over the world, receivingcountless shares and likes in less than three days. Many people shared their stories in the comment sectionabout how they "pay it forward"and a lot more people decided to follow my example to do the goodpractice just as we did. viewing those heartfelt comments, I realized that by helping others, we can starta chain of reaction of positive feeling and good deeds that can benefit our whole society.

21.B【解析】两种育种方案均属于杂交育种,依据的变异原理都是基因重组,A项正确;水稻是自花传粉植物,让水稻自交更为方便,方案二每一代均需要进行杂交,操作较为复杂,B项错误;若方案二中F1植株全部耐盐,F2耐盐:不耐盐=1:3,为11:1:1的变形,说明耐盐性状受两对等位基因控制,C项正确;方案二与方案一相比,最突出的优点是后代的遗传物质更多的来源于品种B,使后代更快更多地积累水稻B的多种优良性状,D项正确。

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