衡中同卷 2023-2024学年度高三一轮复习滚动卷新高考版(三)数学考试卷

衡中同卷 2023-2024学年度高三一轮复习滚动卷新高考版(三)数学考试卷试卷答案,我们周报网收集并整理关于衡中同卷 2023-2024学年度高三一轮复习滚动卷新高考版(三)数学考试卷试卷答案得系列试题及其答案，更多试题答案请关注我们网站

衡中同卷 2023-2024学年度高三一轮复习滚动卷新高考版(三)数学考试卷试卷答案

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13.Whatdoesthemandoprobably?A.He'sapoliceman.B.He'sagardener.C.He'sajournalist.听第9段材料，回答第14至16题

14.Whatistheprobablerelationshipbetweenthespeakers?A.Zookeeperandassistant.B.Tourguideandvisitor.C.Interviewerandjobhunter.15.WhatdidthemandoinAfrica?A.Hevolunteeredatacharity.B.Hetaughtatauniversity.C.Hetraveledaroundthecountry.16.Howdoesthewomanfeelabouttheman?A.Impatient.B.Sympathetic.C.Satisfied.听第10段材料，回答第17至20题

17.Whydoesthespeakerusetheheadphonetocommunicatewiththelisteners?A.Itiscomfortabletouse.B.Thesoundoftheplane'sengineisloud.C.Thelistenerstalkaloud.18.Whatisthecauseofthedarksky?A.Thenighttime.B.Theblacksmoke.C.Thethickclouds.19.Whichsideoftheislandaretheforestsin?A.Thewestside.B.Thesouthside.C.Thenorthside.20.Whatisthetalkmainlyabout?A.Learningaboutavolcano.B.Havingarideinaplane.C.Takingphotosofforests.3

分析根据sin²α+cos²α=1，即可求出．

解答解：∵sin$\frac{α}{2}$=$\frac{1}{2}$，
∴cosα=±$\sqrt{1-si{n}^{2}α}$=±$\sqrt{1-\frac{1}{4}}$=±$\frac{\sqrt{3}}{2}$，
故选：D．

点评本题考查了同角的三角函数的关系，属于基础题．