金华十校2023-2024学年高一年级第二学期期末调研考试试题(数学)试卷答案,我们目前收集并整理关于金华十校2023-2024学年高一年级第二学期期末调研考试试题(数学)得系列试题及其答案，更多试题答案请关注本网站↓↓↓
金华十校2023-2024学年高一年级第二学期期末调研考试试题(数学)试卷答案
以下是该试卷的部分内容或者是答案亦或者啥也没有，更多试题答案请捕获只因
Scientistsbelievethediscoverycouldpavethewayforneweyetherapiesthatareaffordableandcanbedonebythepatientathome.Prof.Jefferysaid,"Usingsimplebriefexposuretolightwavelengthsthatrechargetheenergysystemwhichhasdeclinedintheretinacells,isratherlikerechargingabattery."Thetechnologyissimple,safeandverypromising.28.WhatdoesJefferyexpressinparagraph2?A.Ageaffectsthevisualsystem.B.It'snecessarytoprotecteyesight.C.Theageingpopulationisnowserious.D.Weakcolorvisionismainlycausedbyageing.29.Whatcanweknowaboutthestudyfromparagraph3?A.Researchersdidnotgetenoughdata.B.Itaimstoimprovethevisionoftheelderly.C.People'seyesightcanbeimprovedbylong-wavelightD.Participantsover40benefitedmorefromthestudy.30.Whatisthesignificanceofthisdiscovery?A.Ithelpspeoplesavemoreelectricity.B.It'spracticalandhasmedicalvalue.C.ItsavesmanyagedpeoplewithoculardiseasesD.It'sthemosteffectivetreatmentforvisionloss.31.Whereisthistextmostlikelyfrom?A.Atravelguidebook.B.Apopularnovel.C.Afashionmagazine.D.Ahealthjournal.DScientistsandengineersarepreparingforpossibletravelintointerstellar(space,theareainbetweenstars,inthedistantfuture.Anewreportexaminesthepossibleproblemofchangesinlanguageonlongspacetrips.TwoAmericanresearchershaveexploredonepossibleproblemwithsuchtravel.TheyconsideredthepossibilitythatchangesinhumanlanguagecoulddevelopovertimeandleadtomajorcommunicationproblemswithpeopleonEarth.ThelanguageexpertsareprofessorsAndrewMcKenziefromtheUniversityofKansas,andJeffreyPunskeofSouthernIllinoisUniversity.Thetworecentlypublishedapaper,whichconsidersverylongtripsnecessarytoreachinterstellarspace,estimatedtobeabout18billionkilometersfromEarth.Italsoexaminesthepossibilityoffuturecolonization(殖民地的开拓)高三英语第7页（共12页)
分析根据A，B，D三点共线，得出t+（2+t）=1，求出t的值，化简$\overrightarrow{CD}$=t$\frac{1}{2}$$\overrightarrow{CA}$+（2+t）$\overrightarrow{CB}$，得出$\overrightarrow{BD}$=$\frac{1}{2}$$\overrightarrow{BA}$，D是AB的中点，即可求出面积比是多少．
解答解：∵A，B，D三点共线，且$\overrightarrow{CD}$=t$\overrightarrow{CA}$+（2+t）$\overrightarrow{CB}$，
∴t+（2+t）=1，
解得t=-$\frac{1}{2}$；
∴$\overrightarrow{CD}$=-$\frac{1}{2}$$\overrightarrow{CA}$+$\frac{3}{2}$$\overrightarrow{CB}$，
∴$\overrightarrow{CD}$-$\overrightarrow{CB}$=$\frac{1}{2}$（$\overrightarrow{CB}$-$\overrightarrow{CA}$），
即$\overrightarrow{BD}$=$\frac{1}{2}$$\overrightarrow{BA}$；如图所示，
∴BD=$\frac{1}{2}$AB，即BD=AD；
∴△CDB的面积和△CDA的面积之比为1：1．
故答案为：1：1．
点评本题考查了平面向量的应用问题，解题的关键是利用三点共线求出t的值，化简$\overrightarrow{CD}$=t$\frac{1}{2}$$\overrightarrow{CA}$+（2+t）$\overrightarrow{CB}$，得出D是AB的中点，是综合性题目．
