2022英语周报36期七年级答案

10.BC【解析】本题考查基本不等式的应用,考查运算求解能力因为a b 2ab-4=0,所以a b=4-2ab≥4-2×(0)2,所以(a b)2 2(a b)-8≥0,解得a b≤-4或a b≥2.因为a>0,b>0,所以a b≥2,故A错误,B正确;因为a b 2a6-4=0,所以2ab=4-(a b)≤4-2√ab,所以2ab 2√ab-4≤0,解得ab≤1,所以ab≤1,故C正确,D错误

第一节参考范文:Last Friday evening witnessed a breathtaking English Singing Contest in our schoolstadium, where 15 singers competed for"The Best English Singer of the YearThe singers, who had stood out from the first round of selection, gave energeticperformances on stage. Throughout the contest, the atmosphere in the stadium was extremelyexciting, with many students singing along to nearly every song. At last, the award went toZhang Xin from Class 1 Grade 1Everyone agreed that the contest enriched our campus life as well as kindling ourpassion for English learning

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