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7.B【关键能力】[文]本题考查考生对生物[章]进化的理解能力和综[来]合运用能力。【必备[自]知识】解答本题需要[知]掌握物种形成的基本[嘛]环节、生物进化的实[答]质、生殖膈离与地理[案]隔离的区别等知识【[网]解题思路】从题干信[文]息不能判断出b2和[章]c2、d1和d2之[来]间一定出现了生殖隔[自]离,A错误;生物进[知]化的实质是种群的基[嘛]因频率发生改变,进[答]化过程中基因种类可[案]能不变,B正确,D[网]错误;经低温或秋水[文]仙素处理得到的某些[章]多倍体植物是新物种[来],但其形成不需要经[自]过地理隔离,C错误[知]
第四部分写作第一节[嘛]短文改错On Women's Day,my father and I planned to give mymother A ssurprise[答],we did something[案] specially[网] for her.speci[文]alKnowtha[章]t she was always unwilling[来] to buy herselfKn[自]owinganyt[知]hing,we decided tobuy him a perfect gift.In thehersho[嘛]p,the shopassis[答]tant recommend[案]ed a beautiful[网]necklace,[文]what I thought was the very thing for mywhichmo[章]ther.Howe[来]verweboug[自]ht it withoutTh[知]erefore/T[嘛]hushesita[答]tions.The[案] moment wetake out the necklace,[网]myhesitat[文]iontook2m[章]other was so surprisin[来]gthat she could not say a word.surp[自]risedIt's my ggreat pleasure that my mother liked o(the gift,and I hope my mother will be happy and healthy forever.
