题目

已知W、X、Y、Z为短周期元素，它们的原子半径依次增大，W与Z、X和Y分别同主族，Y、Z同周期。Z能与X形成两种常见的离子化合物，离子个数比均为2∶1。下列说法错误的是( ) A．Y、Z、X、W的原子序数依次减小 B．W与X可形成既含极性共价键又含非极性共价键的化合物 C．由W、X、Y、Z四种元素组成的常见化合物一定显酸性 D．X的简单氢化物的沸点低于Y的简单氢化物的沸点 第Ⅱ卷(非选择题，35分) 第四部分　写作（共两节，满分35分） 第一节 短文改错（共10小题；每小题1分，满分10分） 此题要求改正所给短文中的错误.对标题号的每一行做出判断：如无错误，在该行右边的横线上划（√）；如有错误（每行只有一个错误），则按下列情况改正： 此行多一个词：把多余的词用斜线划掉，在该行右边横线上写出该词，并也用斜线划掉。 此行缺一个词：在缺词处加一个漏字符号（^），在该行右边横线上写出该加的词。 此行错一个词：在错的词下划一横线，在该行右边横线上写出改正后的词。 注意：原行没有错的不要改。 My cousin Xiao Hong and I went on a trip to my uncle                76.________ last Sunday. We were riding along a hillside then suddenly               77.________ some big stones were rolled down and knocked us off our bikes.              78.________ Xiao Hong's legs got seriously hurt and so were mine. We                79.________ couldn't move a bit. Fortunately, I saw some farmers ahead.                     80.________ Waving our hand, we cried for help like crazy. On hearing               81.________ us, they ran to the spot as fast as they can. Thanks to                        82.________ their help, we were all sent to a nearby hospital and received            83.________ medical treatment in time. Although we do not know about their              84.________ names, we feel they like our dear big brothers and sisters.                 85.________