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【正文】 )20176。(3)∠EDC=112∠BAD(4)有∠EDC=2∠BAD,理由如下:因?yàn)椋粒模剑粒潘浴希粒模牛健希粒牛挠忠驗(yàn)椤希粒牛模健希茫希牛模糜忠驗(yàn)椤希粒模茫健希拢粒模希录础希粒模牛希牛模茫健希拢粒模希滤浴希粒模牛健希拢粒模希拢希牛模盟浴希茫希牛模茫健希拢粒模希拢希牛模糜忠驗(yàn)椋粒拢剑粒盟浴希拢健希盟浴希牛模茫健希拢粒模希牛模眉础希牛模茫剑?2∠BAD51.D 2.B 3.B 4.B 5.正方體或球體 6.直四棱柱或長方體 7.成 8.4,32 9.略 10.(1)8 12(2)18(3)長方形 240cm2 11.36cm2 11.(1)直棱柱(2)側(cè)面積為6ab,全面積為6ab +33b2 61.D 2.D 3.A 4.C 5.5 6.乙 7.2 8.8.4 9.(1)6 3(2)8 6 6 中位數(shù),因?yàn)橹形粩?shù)只表示所有者所捐書本的居中者,既不能反映總量,也不能反映其他人捐書情況。10.(1)40 20(2)1050(3)略71.A 2.B 3.C 4.B 5.直四棱柱 6.20000 7.60176。 8.64 9.m∥n理由如下:因?yàn)椤希保希常剑梗?76。 ∠3+∠2=90176。 所以∠1=∠2 所以m∥n 10.(1)①③或②③(2)已知:②③理由如下:因?yàn)椤希拢牛希健希茫模稀希拢希牛健希茫希模拢牛剑茫乃浴鳎拢牛稀铡鳎茫模弦驗(yàn)椤希希拢牛健希希茫模拢希剑茫纤浴希希拢茫健希希茫乃浴希希拢牛希希拢茫健希希茫拢希希茫录础希牛拢茫健希模茫滤浴鳎粒拢檬堑妊切?11.略81.B 2.B 3.D 4.C 5.40 6.14 7.50176?;颍福?76。 8.18條 9.(1)14m3(2)7000m3 10.90176。11.5.3m91.B 2.A 3.D 4.A 5.> 6.≤21 3 7.3a-7≤0 8.x<225 9.(1)x≤1(2)x≤-11 10.(1)>(2)>(3)>(4)>(5)>(6)= 規(guī)律:a+b≥2ab(a,b為正數(shù))11.12,13,14,15,16,17,18,19,20101.C 2.C 3.D 4.C 5.-1;2<x<3 6.a≥3 7.-6 8.a<x≤b 9.(1)1<x<4(2)-7 <x≤110.①y=20-2x②5<x<10111.B 2.C 3.C 4.C 5.幾排幾座 6.-1(,)(,)(,)(,)2 7.(7,-2)8.(-3,-2)或(7,-2)9.電視臺(tái)41廣場22學(xué)校53汽車站4510.(1)關(guān)于x軸對(duì)稱(2)關(guān)于y軸對(duì)稱 11.A(4,3)P(-4,-3)B(3,1)Q(-3,-1)C(1,2)R(-1,-2)橫坐標(biāo)變成相反數(shù),縱坐標(biāo)變成相反數(shù)N(-x,-y)121.B 2.B 3.B 4.C 5.x≠4 6.3 7.y=12x+2 8.y=1.8x-6(x>10)9.16y=8(0<x≤3)圖略3x=5y=1.2x+4.4(x>3)10.1<k<2 11.y=25131.A 2.D 3.B 4.C 5.π,S,R 6.-3 7.y=x+1(答案不唯一)8.y=2x+3 9.y=242345x-5 10.(1)y=-3x+4(2)(0,-2)11.(1)25cm 30cm 2.5小時(shí) 2小時(shí)(2)y甲=-10x+25(0≤x≤2.5),y乙=-15x+30(0≤x≤2)(3)x=1141.D 2.D 3.C 4.A 5.笛卡爾 6.k=-32 7.-2,2 8.8 9.x≤1 10.(1)y=-3x-5圖略(2)5(3)-8≤y≤7 11.(1)96120(2)145(3)y=-x+145(x≥25)151.D 2.A 3.C 4.D 5.-5≤y≤19 6.三 7.0 8.(-2,4)等腰直角y=x+2 9.1<x<4 10.(1)k=1,b=2(2)略(3)(0,2)(4)x=-2(5)x>-2 11.(1)a=3,c=5 y=3x(0≤x≤6)(2)28元y=5x-12(x>6)138英語 1一、1.C 2.B 3.A 4.B 5.C 6.A二、1.E 2.C 3.A 4.B 5.D三、1.Twiceaweek. 2.Becausetheythinkbasketballisdifficultforthem. 3.Herunsfor30minutes. 4.Threetimesamonth. 5.Becauseshelikesjunkfoodandshedoesn’tliketoexercise.四、1. 1∶00 2.2∶45 3.4∶30 4.6∶15 5.8∶002一、1.headache 2.eyes 3.sore 4.thirsty 5.angry二、1.B 2.C 3.C 4.D 5.A 6.C 7.A 8.D 9.B 10.B三、Problems:betired,can’tsleepwell,haveasorebackTreatments:Shouldhavearest.Shouldn’tdrivethecartowork;Don’tthinktoomuch.Drinksomemilkbeforegoingtobed;Mustn’tworktoohard,Shouldliedownandhaveagoodrest.3一、1.exciting 2.listening 3.sounds 4.Babysitting 5.Tourists二、1.A 2.C 3.B 4. D 5.B三、DearMissWang,I’msorryIcan’tgotoschooltoday.Ihaveafever.Thismorningmymothertookmetoseethedoctor.Thedoctorlookedmeovercarefullyandsaidtherewasnothingseriouswithme.Hetoldmetotakesomemedicineandhaveagoodrestfortwodays.SoI’dliketoaskfortwodays sickleave. Thanksalot. Emma4一、1.sixkilometers 2.Bysubway 3.Howlongdoesittakeyoutogettoschoolbysubway 4.fiveminutes 5.onfoot 6.farfrom 7.bus 8.ridemybike 9.tenminutes 10.twentymi-nutes二、1.D 2.B 3.B 4.A 5.C 6.C 7.A 8.B 9.D 10.A 5一、1.D 2.C 3.C 4.C 5.D 6.B 7.A 8.C 9.C 10.A二、picnic,TheMoonPark,NextSunday,April28th,schoolgate,eight,morning,thefood,yourself,Fred6一、1.going 2.win 3.brighter 4.curlier 5.funnier二、1.D 2.A 3.C 4.C 5.C三、1.A 2.B 3.A 4.A 5.A7一、1.teaspoons 2.butter 3.cutup 4.Pour 5.bowl二、1.E 2.B 3.D 4.C 5.A三、DearBruce,Thankyouforreadingmyletter.I’mamiddleschoolstudentinBeijing,China.Iamfourteen.IstudyatBeijingMiddle School.Iamtallandthin,sobasketballandfootballaremyfavouritegames.Ihavealotoffriendsatschool.Sometimeswegooutforapicnictogether.Sometimeswegooutfordinnertogether.AndIoftenplaybasketballwiththemafterschool.Myhomeisnotfarfrommyschool.Igotoschoolonfooteveryday.Ittakesme5minutes.Andbothmyparentsareworkers.Theyworkinthesamefactory.Lookforwardtoyourletter.8一、1.C 2.C 3.B 4.A 5.A 6.C 7.B 8.D 9.A 10.C二、1.B 2.D 3.F 4.139C 5.E三、1.C 2.D 3.A 4.A 5.B 6.D 7.B 8.C 9.D 10.B9一、1.D 2.C 3.A 4.B 5.A二、1.Heistooyoungtogotoschool. 2.Sheisagreattennisplayer. 3.Yesterday,LiMingwonfirstprizeinthespeechcompetition 4.WhendidyoustartlearningEnglish? 5.Heisacreativeperson/man.三、1.B 2.C 3.B 4.D 5.A10一、1.national 2.growup 3.part-timejob 4.keephealthy/fit 5.computerprogrammer二、1.D 2.C 3.B 4.C 5.D 6.B 7.D 8.A 9.D 10.B三、1.A 2.C 3.B4.D11一、1.dothedishes,cleanthetable,cleanthefloor,cookthemeal,takeoutthetrash,washthecar,cutthegrass,foldtheclothes,watertheflowers,dothelaundry?二、2.can’t 3.haveto 4.I’ll 5.don’t 6.couldI 7.do三、1.D 2.A 3.B 4.A 5.D12一、1.e 2.b 3.f 4.d 5.a二、1.B 2.C 3.B 4.A 5.C三、LastSaturdaymorningMrChenlefthomeearlytogofishing.Verysoonhegottoariver.Hesatontheriversideandbegantofish.Thesunwasshiningbrightlyoverhishead.Buthewasunlucky.Whenthesunwentdown,hestillhadn’tcaughtanyfish,sohefeltverysorry/sad.Hethoughtthathiswifemightlaughathimbecausehehadcaughtnothing.Whatshouldhedo?Hebecameworried.Suddenlyhegotanidea.Herantothefishmarketatonceandboughttwobigfish.Thenhehurriedbackhappily,thinkingthathiswifewouldsaysomethinggoodtohim.13一、1.fifty-seven 2.kilometers 3.concert 4.necessary 5.both 6.moreoutgoing 7.serious 8.minutes 9.sending/posting 10.invitation 11.faster/quicker 12.laughing二、1.C 2.D 3.C 4.B 5.D 6.A 7.D 8.A 9.D 10.A14一、1.creative 2.Hens 3.slices/pieces 4.leader 5.ingredients 6.born 7.deli 8.Seriously 9.Italian 10.grows二、1.F 2.H 3.D 4.A 5.B 6.C 7.E 8.G 9.I 10.J 11.I 12.J 13.H 14.C 15.E 16.B 17.A 18.G 19.D 20.F三、1.KFC 2.SmallPotatoRestaurant 3.MoonlightRestaurant 4.SmallPotatoRestaurant 5.Jason’ssnack6.MoonlightRestaurant15一、1.A 2.B 3.B 4.A 5.D二、1.B 2.A 3.C 4.D 5.C 6.A 7.B 8.D 9.B 10.B三、1.C 2.B 3.A 4.D 5.A科學(xué)11.D 2.D 3.C 4.D 5.D 6.(1)A.蒸發(fā)B.水汽輸送C.降水D.地表徑流E.下滲F.地下徑流(2)海陸間 7.負(fù)氫 8.80021.C 2.D 3.B 4.D 5.B 6.等于等于 7.瓶口截面小,液體深度增大,液體壓強(qiáng)也增大。瓶口面積小,壓力不變,壓強(qiáng)增大。8.3∶4 9.略 10.(1)①④⑤(2)①②③或①②④(3)①③④31.A 2.B 3.B 4.B 5.B 6.溶解過濾蒸發(fā) 7.約26.5%約26.5% 8.(1)隨著溫度的升高,a物質(zhì)的溶解度上升明顯。(2)在60176。C時(shí),a、b兩種物質(zhì)的溶解度相等飽和溶液。9.100克41.B 2.D 3.D 4.A 5.A 6.D 7.①防止對(duì)太陽輻射的吸收,影響測(cè)量結(jié)果。②朝南開,以防止觀察時(shí)儀器受到陽光的照射。51.B 2.C 3.B 4.C 5.B 6.D 7.鋒復(fù)雜 8.水氣濕度計(jì)干球毛發(fā) 9.大低大陸海洋西北 10.略 11.略 12.C61.B 2.B 3.C 4.C 5.C 6.C 7.D 8.A 9.bbdfd71.B 2.B 3.B 4.C 5.陽光水分 6.(1)光并未影響生長素的分解和生長素的向下運(yùn)輸。(2)胚芽鞘被玻璃片分隔成兩半
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