内蒙古赤峰市2021-2022学年度高三12月联考质量监测英语答案

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21.B细节理解题。根据 Summer中“.. that aims to display big events of2020..”及“ Price:￡16.99”可知,你需【2022仿真模拟卷·英语参考答案第18页BY】要花费16.99美元购买 Summer这本涉及2020年大事件的书。22.D细节理解题。根据 Grown Ups中“ Author: Marian Keyes”及“ There are few writers as capable of showing thefrictions of family life with as much humor and accuracy as Marian Keyes and her latest sees her on flashing form. " H]知, Marian Keyes的书以幽默的方式展现了家庭冲突23.C细节理解题。根据 Redhead by the side of the road中“.. a character study of a lovable eccentric(古怪的人), stuck in his ways."可知,这本书探索了一个奇怪的男人的人物性格。

17.解:(1)设等差数列{an}的公差为d,则a4=5+d,a2=5-d,a7=5+4d.因为a4+1是a2+1与ar+3的等比中项,所以(a4+1)2=(a2+1)(a7+3),…………2分即(6+d)2=(6-d)(8+4d),化简得5d2-4d-12=0,…3分解得d=2或d=-5(舍),……………4分所以an=2m-16分(2)由(1)知,an=2n-1,所以b=一1一aan+1(2n-1)(2n+1)-12n+…………………………………8分所以T。=b+b2+b3+…+b(-3+3-3+3-÷+…+an-1-an+)(2n+12n+112分