百师联盟高三第三次联考 答案

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3.C【解析】设等差数列{a.}的公差为d,则由S3=a5得，3a1十3d=a1十4d,则d=2a1,故Sn=na1十S（mDd=n2a1,故=n2.放选C.

第二节书面表达One possible versionDear Jonah,How are you? Im writing to share my favorite bookwith you. My favorite book is called How to improve Englishwriting. The color of its cover is white and yellow. It has126 pages. It's a birthday gift from my sisterLast term I did poorly in an important English testOne of the big reasons was that i got few marks in the writ-ing part. Iwas very upset. My sister sent me this book andencouraged me to improve my writing. From then on, Ispent more time in writing. Thanks to the book I havemade great progress in writing. I love this bookBest wishes IYoursLi Hua