2021-2022八上英语周报40期答案

7.D【解析】本题考查元素周期表与元素周期律的应用。短周期元素N下、Z、W的原子序数依次增大,X、W同主族且X是短周期原半径最小的主族兀素,则X为H、W为Na;Z无最高正价,且化物中可形成2条共价键,则Z为O;回化合物的结构式可知Y共C。0、C的最筒单氢化物分别为H2O和CH1,氧元素的非金属于砍元素,故H2O的稳定性强于CH,A错误;Na与O形成的物Na:O2中含有价键,B错误:H、O、C可形成多种酸,如H1COH1H1C:O1等,C錯误; NaHcO3加热可发生分解反应生成alO)、,)王磅

第四部分写作第一节One possible version.Dear JonahHow are you? I'm writing to share my favorite book with you. My favorite book is called How to improveEnglish writing, whose cover is white and yellow, including 126 pages. it's a birthday gift from my sisterLast term i did poorly in an important English test, which upset me. My sister sent me this book andncouraged me to improve my writing. From then on, I spent more time in writing. Thanks to the book,have made great progress in writing. I love this book.Best wishes!YoursLi Hua第二节One possible versionHours passed when my mom asked suddenly, Where's the dog? "Kleo was a quiet dog for the most part, soit took us time to realize he wasnt in the calk evgot very worried. Did anyongecar at our last stop? " Mom asked. None of us had. Mom phoned the gas station, but by that time they hadclosed for the day and there was no answer. So we turned around and headed back to that gas station as fastas we couldWe went all the way back to the gas station but couldn't fins Kleo. My sister and I were crying. Sure we'dnever see him again. We pulled into the gas station parking lot, and as our lights swept the station, we sawKleo. He was sitting in front of the dark station, very wet, patiently waiting for our return My mother jumpedout and opened the back door. We had no blankets, so she wrapped him in her sweater. We all laughedhappily and told him what a good dog he was

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