2022英语周报高考版专项训练答案

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

13解析:根据加入NaOH溶液后曲线变化可知③是pll变化,曲线①②代表合磷微粒含磷微粒只有2种,结合起点pH,可推出HlPO2为一元弱酸(若为一元强酸戍二元戍三元酸,含磷微粒不是2种或者起点pH不对应)。囚为HPO2为一元弱酸,故曲线代表δ(HPO2曲线②代裘δ(H2PO2),故A借误:国为HPO2为一元弱酸,故等浓度NaOH与次磷酸二者1:1好中和,由20mL时达到滴定终点可知,次磷酸浓度为θ10omL.',故B正确由曲线①②交点可知b(H1PO2)=5(H2PO2),故(H3PO2)=c(H2PO2),对应曲线③pH=3即c(H')=103ml·L1, Ka HaPO2)c(Il3PO)103,故H2PO2水解常数K=≈10×10-1,故C错误:因为HPO2为一元弱酸,故NaH2PO2是正盐,其水溶液呈城性,故D错误。答案:B

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