江淮名卷·2022年安徽中考押题卷(二)2历史试题答案

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4.D【命题意图】本题以拱桥为背景，考查抛物线的标准方程及其简单几何性质，体现了数学运算、逻辑推理等核心素养【解析】由题意知，桥洞的截面可看作抛物线.以拱顶为坐标原点，过拱顶的水平面为x轴，过拱顶且垂直于x轴的直线为y轴，建立平面直角坐标系.设抛物线的标准方程为x2=-2py(P>0).由题意知，抛物线经过点(6，-4)，所以36=8p,所以2p=9,所以抛物线的标准方程为x2=-9y.将x=4.5代人x2=-9y,得y=-2.25.所以相比枯水时期水面上升了5-2.25=2.75(m).故选D.关键点拨注意到枯水时期水面位于桥嫩的下方1m处，由此要准确确定抛物线上一点的坐标

第二节One possible version:Hle desperately chased after the truck. Janey watched him. "What is he doing?she thought. annoyed. 'The truck stopped and Harry jumped into the back of the truck.Janey rushed from the house to the truck. She asked why his newspaper was importantbut Harry went straight ahead as if he hadnt heard her. As Harry was looking for hisnewspaper,Janey saw some pieces uf blue glass on Harry's shoes. Suddenly, she re-membered the photo of the vase on the TV. She looked again at the pieces of glassAre thcy from the vasc in the art gallery? "shc thought. "Is larry Black the thief?"Then Janey called the police on the telephone. Two policemen arrived guicklyThey checked Harry's shoes and Harry felt confused. " What's wrong? "he asked.Onef the policemen took a piece of glass from Harry' s shoes. He looked at Harry carefully, exclaiming the glass was from a very expensive vase. Suddenly, I larry understood.Police cars and policemen arrived. They looked in the truck for the million-dollar painting. later, they found the right newspaper and the painting