2022英语周报g答案

Our school had a school choir competition June 20. As Panning, the competition tookonplannedplace in the main hall. I was very nervousafter we began to perform. Hid!"IStartto have thebeforestartedhiccups(t] WM). Lisa advised me to hold my breath and countedto ten, while Amy brought somecountwarm water and asked me to drinkthemwaItMy friends tried to help me in manybut nothingwaysworked."BOO! " Tony frightened me from behind my back. I was Suchsurprised that my hiccupsstopped, At last, we sang inbeautifully harmony on the stage.beautiful

12D解析:本题考查元素推断及元素周期律。W、Y、XZ均为短周期主族元素且原子序数依次增大,根据Y恒有c(Na )=3c(HXO) 3c(),面丁原子结构,可知Y为O;W与X位于同主族,WX、Z的最外层电子数之和与Y的最外层电子数相等,当W、X位于第IA族时,Z位于第ⅣA族则W为L,X为Na,Z为S;当W、X位于第ⅡA族时Z位于第ⅡA族。W、Y的最简单离子分别为L计、O2,A项正确;W、X的最高价氧化物对应的水化物分别为LOH、aOH,其碱性:NaOH>LOH,B项正确;钠元素与氧元素形成的化合物为Na2O或Na2O2,C项正确;z、Y形成的化合物为SO2,能与强碱反应,但不是常见的半导体材料,硅单质才是常见的半导体材料,D项错误。CO2的转化可知,①②中捕获CO2时碳元素化合价未发生变化,

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