∵当x∈（-1,0）时,f（x）=2x-1,∴f=-,
故f（log220）=.
16.C ∵f（x+2）=-f（x）,当x=-1时,f
（1）=-f（-1）=-f
（1）,∴f
（1）=0,故p1正确;
∵f（x+2）=-f（x）,∴f（x+4）=-f（x+2）=f（x）,
∴y=f（x）的周期为4,y=f的周期为=8,故p2错;
∵当x∈[0,1]时,f（x）=1-x2,∴f（x）在区间[0,1]上递减,
∴函数y=f（x-1）在（1,2）上递减,故p3错;
∵当x∈[0,1]时,f（x）=1-x2,当x∈[-2,-1]时,x+2∈[0,1],
∴f（x）=-f（x+2）=-[1-（x+2）2]=（x+2）2-1,
∴f（x）在[-2,-1]递增,从而f（x）在[-2,0]递增,在[0,2]上递减,
又f（x）是周期为4的函数,
∴f（x）的增区间为[4k-2,4k],即4k-2≤2x-1≤4k,
∴2k-≤x≤2k+,
∴y=f（2x-1）的递增区间为,k∈Z,故p4正确,故选C.
17.A ∵f（x）是R上的奇函数,满足f（x+2e）=-f（x）,∴f（x+2e）=f（-x）,
∴f（x）的图像关于直线x=e对称,∵f（x）在区间[e,2e]上是减少的,∴f（x）在区间[0,e]上是增加的,
令y=,则y'=,
∴y=在（0,e]上递增,在（e,+∞）递减.∴b=>=c>0,
a-b=-==<0,a-c=-==>0,∴a>c.
∴0f（a）>f（c）.
课时训练（九） Unit1（八下）
（限时:
30分钟）
Ⅰ.单项选择
1.—Doyourememberwhatshelookedlikewhenyoufirstmether?
—Ofcourse.Shewastallandthin longhair.
A.inB.withC.onD.by
2.[2018·苏州]—I'mgoingtomissyou,dear.
—Ifeel thesame.
A.hardlyB.exactly
C.seriouslyD.properly
3.[2018·黔南]Jackhaslearnedmoreaboutteamwork（团队合作） hejoinedthesoccerteam.
A.untilB.sinceC.whileD.though
4.[2018·贵港]—Manywildanimalsareingreatdanger.
—Let's tosavethem.
A.takeoffB.takedown
C.takeactionD.takeafter
5
.[2017·泰州]Dianausedto towork,butnowsheisusedto becausetheroadiscrowdedandshewantstokeepfit.
A.drive;walkingB.drive;walk
C.driving;walkD.driving;walking
6.[2017·黔西南]HowdoesJane withhermother?
making
phonecallsorchattingonline?
A.keepintouch;WithB.keepingtouch;By
C.keepintouch;ByD.keepingtouch;With
7.Helen Jeffwhentheywereboth25yearsold.
A.gotmarriedtoB.gotmarriedwith
C.marriedwithD.marriedto
8.Mygrandmalives inheroldhouse,butsheneverfeels .
A.lonely;lonelyB.alone;alone
C.lonely;aloneD.alone;lonely
9.[2018·日照]—Whenwillyougivethenovelbacktome?
—Sorry,I it.HowaboutFriday?
A.didn'tfinishB.won'tfinish
C.haven'tfinishedD.don'tfinish
10.[2018·苏州模拟]Pickupyourpenanddrawyourowninvention.Maybeitwillbe arealproductoneday!
A.turnedonB.turneddown
C.turnedintoD.turnedoff
Ⅱ.[2017·恩施]完形填空
HaveyoueverbeentoAmerica?
Iwasonlyan11-year-oldgirlwhenmyparents 11 methatwewouldsoonmovetoAmerica.Wewereonthebusthen.I
cried.IrememberthatIcouldnotbearthethoughtofneverhearing
theradioprogrammeforschoolchildrenagainwhichI 12 everymorning.
Infact,IthinkIcriedverylittlewhenIwassaying 13 tomyfriendsandrelatives.Whenwewereleaving,Ievenfeltalittle 14 becauseIthoughtaboutalltheplacesIwasgoingtosee—thestrangeand 15 placesIhadknownonlyfrombooksandpictures.
ThefirstfouryearsinAmericataughtmetheimportanceofoptimism（乐观）,buttheideadidnotcometo 16 atonce.ForthefirsttwoyearsinNewYorkIwasreally 17 —havingtostudyinthreeschoolsandI 18 mostofmytimelearningtheEnglishlanguage.I 19 hadanytimeforfun.SometimesIdidnotquitekn
owwhatIwasorwhatIshouldbe.Mother 20 andthingsbecameevenharderforme.Ittook
me 21 togetusedtomystepfather.Iwasoften 22 ,andsawnoendto“thehardtimes”.
IhadtodomanythingsforthefamilysinceIknewEnglishbetterthaneveryoneelseathome.
23 ,thingsgotbetterandbetterlaterandalmostallcommontroubles 24 atlast.FromthoseexperiencesIhavelearnedoneimportantrule:
Somethinggoodiscertaintohappenintheend 25 youdogiveup,andjustwaitalittle!
11.A.spokeB.said
C.toldD.announced
12.A.talkedaboutB.watched
C.studiedD.listenedto
13.A.sorryB.goodbye
C.helloD.thanks
14.A.upsetB.disappointed
C.afraidD.excited
15.A.magicalB.bori
ng
C.necessaryD.usual
16.A.himB.meC.herD.it
17.A.interestedB.happy
C.lostD.confident
18.A.wastedB.spentC.usedD.paid
19.A.hardlyB.hardC.nearlyD.always
20.A.returnedB.left
C.noticedD.remarried
21.A.sometimesB.somemoney
C.somewordsD.sometime
22.A.satisfiedB.sad
C.optimisticD.glad
23.A.EspeciallyB.Unfortunately
C.
ImmediatelyD.Luckily
24.A.wentawayB.wentup
C.wentalongD.wentover
25.A.toB.beforeC.wh
enD.unless
Ⅲ.[2019·原创]阅读理解
At9a.m.on21Sept.2017,ahigh-speedtrainleftBeijingforShanghai.Secondslater,whenthescreenshowedthespeedof350km/h,excitedpasseng
ershelduptheircamerasandcellphonesandtookphotosofit.China'snew-generationhigh-speedtrain,theFuxing,isnowoneofthefastesttrainsintheworld.
Bytheendof2017,therewere2,700high-speedtrainsrunningacrossChina,whichmadeup60percentoftheworld'stotalhigh-speedtrains.Chinahasbuiltmorethan10high-speedrailwaysinEurope,South-eastAsiaandSouthAmerica,andisquicklybecomingknownastheleaderofhigh-speedtraintechnol
ogy.
Besideshigh-speedrail,Chinahasimprovedpeople'slivesinmanyotherwaysoverthelasttenyears.Bikesharing,forexample,isnotnewitself.ButChinahasmadeitmuchmorepopularbothinChinaandabroad.LeadingChinesebike-sharingcompaniesMobikeandOfoarenowoperatinginforeigncountries,suchasSingaporeandBritain.
AndbackinChina,ifyourideyoursharedbikeandstop
tobuyabottleofwater,don'tworryifyou'veforgottenyourwallet.Youcouldeasilypaywithyoursmartphonebyscanningtheseller'sQRcode.CashlesspaymenthasgrownintoalifestylechoiceforChinesepeople—evenastreetstoresellingfruithasaQRcode.
Sowhat'snextforChina?
Itseemsthatwestillhavemanymoregreatideastolookforwardto.
26.Which
ofthefol
lowingisNOTmentionedinthepassage?
A.High-speedrailways.B.Bikesharin
g.
C.Cashlesspayment.D.Onlineshopping.
27.Wecanlearnfromthepassagethat .
A.theFuxingisthefastesttrainintheworld
B.Chinaistakingtheleadinhigh-speedtraintechnology
C.Chinahasbuilt60%oftheworld'stotalrailways
D.EuropehashelpedChinabuild10high-speedrailways
28.Howmanyhigh-speedtrainswerethereintheworldbytheendof2017?
A.4,500.
B.3,5
00.C.2,700.D.1,600.
29.Wh
at'sthewriter'sattitudetowardsChina'sfuturedevelopment?
A.Uncertain.B.Positive.
C.Worried.D.Critical.
Ⅳ.[2018·连云港]根据短文意思和所给首字母,写出一个完整正确的单词
T
heBambooTrain,or“Norry”inthelocallanguage,isquitefamousinCambodia.Thetrainisinfactabigbamboobedwithfourwheelsandasmallengine.Itcanrunatt
he30.s ofupto50km/honthetracks.Lotsof31.v gotoCambodiatoenjoytheBambooTrainride.Theyhavetopay5dollarsperpersonto32.g onthetrain.Thebesttimetotakethetrainisfrom4to6o'clockintheafternoon,33.b itiscoolwhenpeopleenjoythecountrysideview.“Itfeelsmorelikearollercoaster,butit'srea
llynice,”aGermanytouristTheresaKessemeiersaidaftershe34.c aride.TheBambooTrainhasbecomeapopulartourista
ttraction.
Ⅴ.从方框中选择恰当的词或短语并用其正确的形式填空（每个词或短语只能用一次）
asoftenaspossible;changealot;onone'sown;recent;waste
35.Asasecondarystudent,Jimcantakeabustoschool .
36.Thatsmallvillage
升级会员 