英语周报外研高二2022-2022答案

ear jonaIm glad to hear from you and i d like to share withyou something about serving chopsticksi As you know, people in China are encouraged to useserving chopsticks, which are different from personal chopticks in shape and colour serving chopsticks are used totake food from shared dishes. You can add food to yourbowl with them, but never place them into your mouth oryour own bowlUsing serving chopsticks benefits everyone at tableFirst of all, it prevents diseases from' spreading while weare eating together. We can also use them to put food intoothers bowls, thus creating a pleasant and harmoniousdining atmosphereHoping you'l come to China to experience themfirst handYoourL i hua

33.(6分,每空1分)(1)胚胎移植(2)O)2维持培养液的pH基本上不发生免疫排斥反应(3)内细胞团(4)D【解析】(1)试管婴儿技术主要包括体外受精、早期胚胎培养和胚胎移植技术。(2)在体外培养受精卵时,给予一定量的O2以维持细胞呼吸,需要提供CO2以维持培养液的pH。受体对移入子宫的外来胚胎基本上不发生免疫排斥反应,这为胚胎在受体内的存活提供了可能(3)胚胎分割要注意将囊胚的内细胞团进行均等分割,否则会影响分割后胚胎的恢复和进一步发育。(4)分析结构示意图,A表示集中式B、C表示环式,D表示分布式,而分布式优于集中式和环式,进而改善优化系统结构和功能。故选D

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