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11.B【解析】本题主要考查元素推断与元素周期律,侧重考查学生的推理能力。由已知得:X为H,Y为C,Z为O,M为Na。半径:OP->Na ,A项错误;工业上采用电解法制备Na,C项错误;乙烯等不饱和烃能使酸性高锰酸钾溶液褪色,D项错误。
书面表达One possible version:Dear Evelyn,I'm glad to express my most sincere appreciation to you.As far as I am concerned,you are definitely right.The official motto of the 2022 Beijing Winter Olympics conveys the core values and vision of the Olympic"Faster,Higher,Stronger-Together".Beijing 2022 will encourage people around the world to come together fora shared future.We hope the whole world will work together.COVID-19 brings all mankind the globalchallenge,so only by helping each other can we build a beautiful future together.In the end,I wish the 2022 Beijing Winter Olympics success,and you could enjoy the athletes'outstandingperformances on television.Yours,Li Hua