2022-2022英语周报初一答案

3.B【解析】H2S溶液、H2S和KHS混合溶液均显酸性，但HS的存在抑制了H2S的电离，故pH:④>①；K2S溶液中S2-的水解程度大于KHS溶液中HS的水解程度，则pH:③>②，故溶液pH从大到小的顺序为③>②>④>①，A错误。在浓度均为0.1mol·I1H2S和KHS混合溶液中，根据物料守恒可得：c(H2S)十c(HS)+c(S2-)=2c(K+),B正确。在K2S溶液中S2-发生两步水解生成H2S,而KHS溶液中HS发生一步水解生成H2S,故溶液中c(H2S):②>③，C错误。在KHS溶液中根据电荷守恒可得：c(H+)+c(K+)=c(HS)十2c(S2-)十c(OH),D错误。

书面表达One possible versionDear PeterI'm writing to invite you to see the Chinese Painting Exhibition to be held in our city.The exhibition will start at 8: 30 am on Saturday and last till 5: 00 pm on Sunday in the city museum It'ssaid that a large number of Chinese paintings, some of which are original works by famous painters like ZhangDaqian and Qi Baishi, will be on display. Besides, there will be various souvenirs to be sold. I know you re veryinterested in traditional Chinese culture, so I can t wait to tell you the news and hope we can go together.Looking forward to your reply.You

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