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江西省2024届八年级第一次阶段适应性评估【R-PGZX-JX】数学.试卷答案

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independence.Whenyou'reonanacademiccareertrack,that'sabigpartoftheexperience-becomingindependentanddesigningyourownprojects.24.Whatdidtheauthordofirstforapostdocposition?A.Workinauniversityforanextrayear.B.Determinewhattodowithhiscareer.C.Lookforaproperlaboratoryforresearch.D.Overcomehisanxietyabouthiscareer.25.Whydidtheauthorchooseyeastcellbiologyforhispostdocposition?A.Hethoughtitwaspopular.B.Helikedexperiencingmultiplefields.C.Heacceptedhisadviser'sandlabmates'advice.D.Heconsidereditunnecessarytoworkinotherfields.26.WhatmadetheauthorpreferEuropeanlaboratories?A.FewsuitablelaboratoriesintheU.S.B.Focusingonresearchandpursuinghisaim.C.Abetteropportunitytofinishhispostdoc.D.Wishingforlivingadifferentlifestyle.27.HowwilltheauthorworkinJohn'slab?A.BydependingonJohn'shelp.B.Bydesigninghisownprojects.C.Bydiscussingyeastingroups.D.Bysharinghisgoodexperience.CAmericahasmorethanenoughfoodforeveryonetoeat.Buteachyear,billionsofpoundsofperfectlygoodfoodgotowaste.Meanwhile,34millionfacehungerintheUnitedStates.Asthecountry'slargestfoodrescueorganization,FeedingAmericapartnerswithfoodmanufacturers,grocerystores,restaurants,andfarmerstorescuefoodanddeliverittofoodbanksservingourneighbors.Eachyear,108billionpoundsoffoodiswastedintheUnitedStates.Thatequatesto130billionmealsandmorethan$408billioninfoodthrownawayeachyear.Shockingly,nearly40%ofallfoodinAmericaiswasted.Foodgoestowasteateverystageoffoodproductionanddistribution-fromfarmerstopackersandshippers,frommanufacturerstoretailerstoourhomes.Foodwasteinourhomesmakesupabout39%ofallfoodwasteabout42billionpoundsoffoodwaste,andcommercialfoodwastemakesupabout61%ofallfoodwasteor66billionpoundsoffoodwaste.FeedingAmericafocusesonreducingfoodwasteonfarmsandinfoodservice,manufacturing,andretail.Lastyear,theFeedingAmericanetworkandourpartnersrescued4.7billionpoundsofgroceries.Thatfoodwentdirectlytomealsforpeoplefacinghunger.ThismakesFeedingAmericathelargestfoodrescueorganizationinthecountry.Foodrescue,orfoodrecovery,isthepracticeofcollectinghigh-qualityfoodthatwould【高三英语第5页（共10页）】906C·HLJ·

分析先求出两直线2x+y-8=0与x-2y+1=0的交点为M（3，2），再分类讨论，用待定系数法求得直线l的方程．

解答解：由$\left\{\begin{array}{l}{2x+y-8=0}\\{x-2y+1=0}\end{array}\right.$ 求得$\left\{\begin{array}{l}{x=3}\\{y=2}\end{array}\right.$，可得两直线2x+y-8=0与x-2y+1=0的交点为M（3，2），
当直线经过原点时，直线l的方程为y=$\frac{2}{3}$x，即2x-3y=0．
当直线不经过原点时，设直线l的方程为$\frac{x}{a}$+$\frac{y}{2a}$=1，把M（3，2）代入，可得$\frac{3}{a}+\frac{2}{2a}$=1，求得a=4，
可得直线l的方程为$\frac{x}{4}$+$\frac{y}{8}$=1，即2x+y-8=0．
综上可得，直线l的方程为2x-3y=0或2x+y-8=0．

点评本题主要考查用待定系数法求直线的方程，体现了分类讨论的数学思想，属于基础题．

江西省2024届八年级第一次阶段适应性评估【R-PGZX-JX】数学.