2018-2022年英语周报高二课标GDY第42期答案

14.AD解析:c到d溶液pH突变,说明c点沉淀达到最大值,a到c发生生成沉淀的反应:2C2++2NH3·H2O+SO=Cu2(OH)2SO4↓+2NH,c到e发生沉淀溶解反应:Cu2(OH)2SO4+8NH3·H2O=2[Cu(NH3)4]2++8H2O+S+2OH。a到b,Cu2+生成沉淀,c(Cu2+)减小,c(Cu2+):a点>b点,A正确;NH3·H2O是弱电解质,书写离子反应时不能拆分,B错误;c点沉淀达到最大值,此时溶质为(NH4)2SO4,c到d,pH突变,但导电率几乎不变,故d点溶质为(NH4)2SO和NH3·H2O,d点溶液中电荷守恒:c(NH)+c(H+)=c(OH-)+2c(SO-),此时pH>7,c(H) 2c(SO),C错误;b'点之前释放NH,导电能力增强,b之后释放[Cu(NH3)4]2+、SO和OH-,导电能力降低,说明导电能力NH>[Cu(NH)4]2+,D正确。

第二节参考范文The girl's mother told Kelly that they were moving to another city. After that they could no longer run thefairy garden. She had reached an agreement with the community that planned to turn it into a park for local residents to relax in. But her daughter did not want to leave the garden, and she had cried several times. She waseven more unwilling to leave her dear fairy. Her mother wanted Kelly to meet her daughter personally. But shewasn t sure how to make her daughter happy.The girl's mother preferred Kelly to act as a fairy to say goodbye to her daughter. Kelly accepted thegirls mothers request. Then they agreed on a time and a place to meet. On the day of the meeting, Kelly ap-peared in front of the girl dressed like a fairy. The little girl was surprised and delighted to see her. They joinedhands and started dancing. She chatted excitedly with Kelly for a long time. Kelly gave her many gifts that sheliked. The girl made Kelly promise that Kelly would visit her often.

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