2021-2022英语周报高三第答案

23.【试题情境】本题是综合性題目,属于探索创新情境,具体是数学探究情境【关键能力】本题考查逻辑思维能力和运算求解能力解题思路】(1)将函数f(x)写成分段函数的形式,并作出函数f(x)的大致困象,数形结合即可得解;(2)首先参变分离,得到2 4 7f(x),然后分别计算f(x)和的取值范围,即可得解a 13x 5,x≤0解:(1)出题知fx)=7-2|x|-x-2|={5-x,0 0的解集是(-2,3)(5分)(2)由a2 (4-(x),-(x) 7=0得“ 4 7=(x)(a>-1分由(1)知f(x)≤f(0)=5(7分)(6分由(1)知f(x)≤f(0)=5(7分4d. 7又=(a 1) -, 2≥2(a 1)a 12=6,当且仅当a=1时等号成立分)所以不存在a>-1,使得关于x的方程a2 (4-f(x))·a-f(x) 7=0有解(10分)

第二节【参考范文】He took out his knife and cut the drunk man's seat belt, pulling him back to the truckAfterwards, he promptly dragged out the fire extinguisher from under the drivers seat and headedfor the burning car once more. Luckily, the fire had been brought under control before things couldget worse. Just at that moment, my father spotted two drunk men still lying unconscious in the backseat. What a narrow escape! Without my fathers kindness and bravery, they would have beenkilled. Warm-hearted, my father even volunteered to drive the three drunk men to their homeDud left Mom and my older sister on the road, and took the three drunks to their home anour's away. Drunk as they were, they could not help expressing their appreciation for my fatherstimely help, without which they would never have survived the terrible accident. Since then, wehave never taken my father s story lightly and his kindness has been planted deeply in my mind. Thexperience taught us not only the importance of preparing for the urgent situation, but also thesignificance of being kind

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