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江西省吉安市永丰县2024年上半年期末质量监测八年级试题(数学)试卷答案
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ferhehrillofridingthroughthemountains,AdeyanjuheadedfoheSabaraesert.TheSahaielyronmehesaid.sigediThereatimekedthetemperaturewhenIwasontheMauritaniansidoftheSaharadthesurfaceofthe53degreesCelsius.Iwaspushingmybike50whichmademethinktherewasinhppenhesaid.Riding0kilmperday,ittookhimsevendaysthedesert.Duringwhatwasthetoughestpartofthejoumey,heexperiencedtwosandstomsandnearlyranoutofwater.Adeyanjuexperiencedafemosthair-raisingmomentsinthedesert,whenhesuddenlystartedhearingvoices,eventhoughnoonewasaroundhimaphenomenoninwhichatmosphericcondinthearidterrain(干旱地☒)cancarrysoundoverlongdistances..“Itbringssoundwavesofthevoicesclearlytoyou.andyouhearvoicesallaround,"hesaid."Manypeoplethinkitisspirits,butit'sjustscience,"headded."Africaisbeautiful.Itisalandofdiversity.It'salandoffriendlinessandpeoplearefriendlyandnice...Itwasabigeye-openerformetosaythatwehavebeenundersellingAfrica...andIcantellyoueverythingIreadabouttheAfricanpeopleortheAfricancountryisfalse.That'swhyIhavelaunchedacampaigncalledThinkAfrica'.Mynextvacation,allIwanttodoisinAfrica.There'ssomuchtodiscoveronthiscontinent."24.WhichisAdeyanju'smostrecentachievement?A.ClimbingMountKilimanjaro.B.RaisingfundsforfightingpolioinLondonCRidingamotorcyclefromLondontoLagos.D.CyclingfromLagostoAcerawithinthreedays.25.Whatcanbelearnedfromparagraph2?ANolifecansurviveintheSahara.(B.Adeyanjuoncedroveatdangerousspeed.C.Sandstormshappenmoreoftenduringdaytime.DAdeyanjusufferedseriouscaraccidentsintheSahara.26.WhatwasthemostscaryinthedesertforAdeyanju?A.Runningoutofwater.B.Hearingvoicesfromnowhere.C.Travelinglongdistancesalone.D.Meetingpeopleinlowspirits.27.WhydidAdeyanjustartthecampaignThinkAfrica?ATopromotehisownpopularity.B.ToencouragepeopletotraveltoAfrica.C.Toraiseenofundsforhisproject.D.Tocorrectpeople'sfalseviewsonAfrica.Sugarisacommonconentnthemoderndiet.Whilesugarissafeinmoderation,heavysugarconsumptioncanbeharmful.Sincesugarphysicallyaffectsthebrainandcausesdesiresandwithdrawalitisalsoapotentialsourceofaddiction.InSingapore,toomuchsugarconsumptioniscausinghighratesoftype-2diabetes().Type-2diabetesarisesfromunhealthyweightgain,oftentheresultofhigh-sugardiets.Today,Singaporehasoneofthehighestratesofsugarconsumptionintheworld.11%oftheSingaporeanssufferfromtype-2diabetes.Toaddressthisproblem,thegovernmentofSingaporedeclaredawarondiabetes"in2017toreduce-sugar-consumptionandpromotehealthylifestyles.OnOctober10,Singapore'sSeniorMinisterofStateforHealthannouncedthatthegovernmentwillbaadverinforuarydinkonallmediaplatformsnationwide.Singaporewillbethefirstcountryintheworldtocarryoutsuchapolicy.AsHealthMinisterEdwinTongexplained,thendmarketingbanwillapplytoprintmedia,television,andtheInternet,includingsocialmedia.Inofadditionosodtheregulationwillaffectyogurt(drinks,instant-eoffee,juices,culturedmilk,and"three-in-onedrinkmixturesthatarepopularinAsia.to00MinisterTongalsoannouncedalabellingprogramforsugarydrinksinSingapore.TheSingaporeanlabellingprogramforsugarydrinksismodeledaftersimilarlabellingprogramsinover英语（新高考版）试题第4页（共8页）
分析x2+mx+1≥0的解集为R，需△≤0，解出即可
解答解：∵x2+mx+1≥0的解集为R，
∴△=m2-4≤0，
解得：-2≤m≤2．
故选：B．
点评本题考查函数恒成立问题、一元二次不等式的解法，考查转化思想、考查学生解决问题的能力．
