第四部分写作第一节Last week our school held the Sports Week. We hade: lots of activities, such as running, hiking, and many kindsof ball games. We even had an exciting two-day sportsmeeting.Nowadays students are busy with their studies anddont get much exercise. This really worries our schoolauthority. So our school started the Sports WeekThe Sports Week proves to be a great success. It notonly builds up our bodies, but trains our characters aswell. Without health, there is no real happiness in life. Weshould work out regularly to keep fit.

20.BD【解析】本题考查早期胚胎培养与核移植。核移植过程中的大核”和“取核”都可以用显微操作法,A正确;图示的过程A为核移植过程,将细胞核移入去核卵母细胞,与细胞膜的流动性无关,B错误;据图可知"三亲婴儿”涉及核移植、人工授精、早期胚胎培养与胚胎移植等技术,C正确;“二亲婴儿”由父亲精子的细胞核DNA、母亲卵母细胞的细胞核DNA、第三方捐卵志愿者的去核卵母细胞共同形成,去核卵母细胞来自第三个人,故会涉及伦理问题,D锖淏。

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