黄冈八模2022答案

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34.(1D沿y轴负方向(1分)10(2分)2.2(2分)【解析】由波的形状确定波源的起振方向沿y轴负方向：z=3m处的波峰传援到x=23m处所用时间为2,则波速为v-23,3m/-10m/1-0时刻，波2传插到，=6m处，波传播到x=28m处所用时问1一28-610s=2.25.(2)(15(1)55+6e【解析】(1)光路图如图所示↑D光要沿ADB的径向射出，而光线进人BC时与PM平行，故O一定为BC后中点，由题知BC=2a由几何关系得D-BMn0BCm60n0-n91分厚故CE=a一4-tanB'M-B'Ccos 6'+CE-B'Pc0s30(1分)解得8=60°由所射定律得sin(1分)市度其中a=30°解得”=后(1分)(1)由几何关系得MP-号(1分)Mo60s602(1分)00-+2(1分)光在顺璃砖中传播的速度为(1分)故用时(1分)解得=(55+6)a(1分)4e

第四部分写作第一节One possible version.Dear JonahHow are you? I'm writing to share my favorite book with you. My favorite book is called How to improveEnglish writing, whose cover is white and yellow, including 126 pages. it's a birthday gift from my sisterLast term i did poorly in an important English test, which upset me. My sister sent me this book andncouraged me to improve my writing. From then on, I spent more time in writing. Thanks to the book,have made great progress in writing. I love this book.Best wishes!YoursLi Hua第二节One possible versionHours passed when my mom asked suddenly, Where's the dog? "Kleo was a quiet dog for the most part, soit took us time to realize he wasnt in the calk evgot very worried. Did anyongecar at our last stop? " Mom asked. None of us had. Mom phoned the gas station, but by that time they hadclosed for the day and there was no answer. So we turned around and headed back to that gas station as fastas we couldWe went all the way back to the gas station but couldn't fins Kleo. My sister and I were crying. Sure we'dnever see him again. We pulled into the gas station parking lot, and as our lights swept the station, we sawKleo. He was sitting in front of the dark station, very wet, patiently waiting for our return My mother jumpedout and opened the back door. We had no blankets, so she wrapped him in her sweater. We all laughedhappily and told him what a good dog he was