2021-2022英语周报高二课标第44期答案

14.72【解析】由a2+1-a2-2an+1-2an=0,得(a2+1-a)-2(an+1+an)=0,所以(a+an-2(a++an)=0.又an>0,所以an+1-an=2,所以{an}是公差d=2的差数列,所以S。-9a19×8×d=-29×82=72

was then promoted as taskmaster. After he had earned enough money, he became a bosseventually.After hearing his words, the boy thought a lot. Success can only be born in action. Workinghard is all winners shared and indispensable experience for achieving their dreams in their lives.Actually the contractors experience was just one good example to prove the truth of it. The boyknew that if he wanted to stand out among people, there was no shortcut or alternative but hardwork. Then he thanked the contractor for his reply and said goodbye to him. Leaving theconstruction site of the skyscraper he already had a firm resolution in his mind that he would starthis own journey right then in order to fulfill his dream in time【参考范文】The contractor told the boy that was also how he had got where he was then. Actually thebuilding contractor had once worked hard and outperformed others through his own constantefforts. If he had worn the same shirt just like other workers and hadn t devoted himself toworking, by no means would he have been noticed by his boss. As a matter of fact he wore his redshirt every day and worked arduously. Soon his day came. He obtained his bosss appreciation and

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