英语周报八年级新目标11期2022-2022答案

參考范文about a week later, Pomilla and Andrew got to meet her son'sSavion comilla and Andrew arrived at the metro station at theappointed time, anxiously waiting for Case to come. When Casearrived with a big smile, they felt very happy and excited. Casehugged Andrew warm-heartedly and reached out his right hand, sayingto him. Would you like to take it again?"without hesitation theboy took it and held it firmly. After talking for some time, Pomillatook out the badge and gave it back to Case. Many passengers tookictures of the sceneTaylor Pomilla was moved and expressed her thanks to Caseagain She asked Case how he could calm andrew down at that timeCase told her that he had a daughter with autism and that he hadreceived special training on how to deal with autistic children. Hepromised to visit them often to help Andrew grow up happily. As hewas talking, he took out a police badge that he made by hiimself andgave it to Andrew, who was more than happy to accept it. Ever sincethen they have been friends

13.AD【解析】溶液中c(H+)=10-2mol·L-1,Ka1c(HC2O4)×c(H+)c(C2O7-)×c(H+)c(H2 C2 O4)Kc(HC2 O4且Kn1>K2,则当溶液中c(H2C2O4)一定时,c(HC2O)>c(C2O3-),当c(H2C2O)增大时c(HC2O)和c(C2O-)均增大,故曲线①代表gc(HC2O7)与lgc(H2C2O1)的关系,曲线②代表lgc(C2O-)与lgc(H2C2O4)的关系,曲线③代表lgc(Ca2+)与lgc(H2C2O3)的关系,A项错误;曲线②和曲线③的交点c(Ca2+)=c(C2O7)=部107432mol·L-1,故K甲(CaC2O4)的数量级为10~°,B项正确;随着c(Ca2+)的增大,溶液中c(C2O)和c(HC2O7)均减小,C项正确;根据曲线①与c(H+)曲线的交点可得,Kac(HC2O4)×c(H+)10-2×10c(H2 C2O4)==1023=102,故当溶液的pH=2时,溶液中一直存在c(HC2O7)>c(H2C2O4),D项错误。

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