题目

任务型阅读阅读短文,按要求完成各题。 Liu Wei is very famous in China because he can play the piano with his toes(脚趾).One day when Liu Wei was only 10 years old, he played a game with some friends. He lost both his arms because of electricity(电). Liu Wei was very sad when both his arms were cut off after the accident. But soon he had to make a choice. “For people like me, there were only two choices. One was to give up all the dreams which would cause a quick death. The other was to work hard without arms to live an excellent life.” says Liu Wei. Liu’s drea常温下,用0.05mol/LNaOH溶液分别滴定10.00mL浓度均为0.10 mol/LCH3COOH( Ka=l×10-5)溶液HCN(Ka=5×10-10)溶液,所得滴定曲线如图。下列说法正确的是A. 对两种弱酸滴定均可选用甲基橙作指示剂B. ③处溶液有:c(Na+)=c(CH3COO-)<c(CH3COOH)C. 溶液中水的电离程度:②>③>④D. 点①和点②溶液混合后:c(CH3COO-)-c(CN-)=c(HCN)-c(CH3COOH)
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