英语周报八年纪2018-2022答案

3.参考答案D说明分析A错误,W为H、Ⅹ为O,组成原子个数比为2:1和1:1的化合物分别为H2O、H2O2,都为共价化合物。B错误,Z为Al,ACl3为共价化合物,熔融状态下不导电,工业上通过电解熔融氧化铝得到铝。C错误,由题图可求出该分子簇的化学式为H2Al2O6Y2,进一步求出Y为Mg,已知Z为Al,同周期从左到右,金属性逐渐减弱,即金属性:Mg>A,则最高价氧化物对应水化物的碱性:Y>Z。D正确,X、Y、三种元素的离子分别为0、Mg2+、AP+,电子层结构相同的离子离子半径随原子序数增大而减小,故X、Y、Z三种元素的离子半径由小到大的顺序为z

As a matter of fact, every day in every way that little elf was a nag(喋喋不休的人! Patrickwas working harder than ever and it was a drag! He was staying up nights, had never felt so weary,and was going to school with his eyes puffed and bleary. Finally, the last day of school arrived andthe elf was free to go. As for homework, there was no more, so he quietly and slyly slipped out theback doorPatrick got his As. His classmates were amazed His teachers smiled and were full of praiseAnd his parents? They wondered what had happened to Patrick. He was now the model kid. Hecleaned his room, did his chores, cheerful and never rude, like he had developed a whole newattitude. You see, in the end, Patrick still thought he'd made that tiny man do all his homeworkBut I'll share a secret just between you and me. It wasnt the elf. Patrick had done it himself

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