2021-2022年英语周报八年级新目标第31期答案

、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)Last Saturday, my classmates and I went to the Chinese Academy of Sciences, what was aprecious chance to get closely to science. The moment whan we arrived there, we were warmlygreeted by an expert stood at the entrance. To have A better understanding of daily basic science,standingwe first attend a professional lecture on the theme of life and Water. The highlight of the visitattendedvere the hands-on experience in the science lab Under the guidances of the expert, we gotinvolved in a medical experiment with great enthusiasm Through the meaningful activity we allagree science plays an important role in our life. We are determining to study hard to understanddeterminedthem

7.B【关键能力】本题考查空间想象能力、运算求解能力【解题思路】先根据三视图还原几何体,得到该几何体的直观图,再求几何体的表面积即可【解析】由三视图还原几何体的直观图,并将该几何体放在棱长为2的正方体中,为如图所示的几何体 ADPFBCE,其中E,F分别为所在正方体的E棱的中点,分析易知四边形PFBE为菱形,连接CPB,EF,AC,则EF=ACPB=2/3,所以四边形PFBE的面积为x22×23=26,所以该几A何体的表面积S=26 2x×1×2 2×(1 2)÷2×2 2×2=12 2/6,故选B图解题关鍵》解决三视图问题的关键点有两个:(1)定形即确定三视图对应几何体的结构特征,熟练掌握规则几何体的三视图是由三视图还原几何体直观图的基础;(2)建立三视图中的数据与几何体的爪何度量之间的关系,正确理解并运用“长对正,宽相等,高平齐

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