七年级下册英语周报新目标46期2021-2022答案

第三节madde it eventuallyOne possible versioni Paragraph 2Paragraph 1Finally, the time came! He took out the soda tinEvery day after school, Reuben started his plan. Cold poured the coins out and began to count. Five dollars! Hisand hungry Reuben wandered the streets, searching for hard work paid off! Holding the soda tin firmly, Reubenthe nail bags carefully. To save more money, he even rushed for the shop to buy the brooch. The moment he gotdecided to deleliver papers in the early morning. Exhausted the beautiful brooch, he burst through the front door andand tired as he felt, he still stuck to the plan. It was the placed it in Doras hand. Never had Dora received such abrooch in the shop window that reminded him that what he gift. Speechless and happy, she held her son tightly intodid was worthwhile. After a long time of hard work, he her arms, with tears welling up in her eye

36.B【解析】若m为有效片段且插入位点b,由于位点b位于基因B中,说明外来有效片段摘人原基因内部,导致基因结构改变,原基因不表达,但插人基因表达,属于基因重组,A项误;若m为有效片段且插入位点a,由于位点a位于无效片段,所以对原基因无影响,属于基因重组,B项正确;若m为无效片段且插入位点a,由于位点a位于无效片段,所以没有发生基因突变,C项错误;若m为无效片段且插入位点b,由于位点b位于基因B中,说明外来无效片段插入原基因内部,导致原基因结构被破坏,原基因不表达,这属于基因突变,D项错误

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