电调俯仰角的优点就是天线在各方位角度的方向图下倾都是一致的,这样水平平面上波瓣的半功率角将保持恒定。但电调俯仰角天线的造价比较昂贵,目前尚未广泛应用。
正确
暂无解析
PartIVTranslation:
Almost30millionAmericansweightatleast20percentmorethantheiridealweight.Infact,theUnitedStateisthemostoverweightcountryinthewild.(PassageThree)
PartIIVocabularyandStructure
Directions:Inthisparttherearefortyincompletesentences.Eachsentenceisfollowedbyfourchoices.ChoosetheonethatbestcompletesthesentenceandthenmarkyouranswerontheAnswerSheet.
21.thedifficultiesassociatedwiththeproject,we’llgoonwithit.
A.GivenB.InspiteofC.ThanktoD.Becauseof
22.Itwasalmostdarkinthestreetsafewverypowerfulspotlights.
A.excludingB.butforC.exceptD.exceptfor
23.today,hewouldgettherebyFriday.
A.WouldheleaveB.Ifheleaves
C.WasheleavingD.Werehetoleave
24.Hegavemesomeveryadviceonbuyingahouse.
A.preciousB.expensiveC.wealthyD.dear
25.Hisgoalisnottobecomeasportsman,achampioninacertainfield.
A.butratherbecameB.butrathertobecome
C.butratherbecomingD.butrathertobecoming
26.Ijustmetheronthewayhomefromthebookstore.
A.onpurposeB.byaccidentC.inaccidentD.incase
27.Idon’tknowabouthim,commentonhimbehindhisback.
A.letaloneB.letgoC.leavealoneD.takeleave
28.Mytransistorradioisoutoforder.It.
A.needtoberepairedB.needrepairing
C.needsrepairingD.needstorepair
29.Noonecouldtellusanythingaboutthestranger.
A.consciousB.mysteriousC.seriousD.previous
30.Maryallfoolishcommentsandkeptonworking.
A.excludedB.ignoredC.deniedD.discharged
31.Iagreewithhim,butnotentirely.
A.untilacertainpointB.tosomepoint
C.tosomeextentD.untilacertainextent
32.Peopleinsomepartsoftheworldoftentaketheirwaterfor.theyuseasmuchwaterastheywish.
A.grantedB.sureC.certainD.pleasure
33.Color-blindpeopleoftenfinditdifficulttobetweenblueandgreen.
A.separateB.compareC.contrastD.distinguish
34.Thousandsofpeopleonthecitytowelcomethevisitingguests.
A.turnedoffB.turnedupC.turnedoutD.turnedover
35.Themountainplaceisbeautiful,buttheworkingconditions,it’sterrible.
A.whenmentionedB.whenitcomesto
C.whenitissaidD.whenitdiesto
36.Areyouspendingmoremoneyonthespaceprogram?
A.infavorofB.byfavorofC.infavortoD.outoffavor
37.Intheofmyparents,standardsofeducationinthepublicschoolareactuallyfalling.
A.ideaB.thoughtC.opinionD.principle
38.fromspace,ourearth,withwatercovering70%ofitssurface,appearsasa“blueplanet”.
A.SeeingB.TobeseenC.SeenD.havingseen
39.Thisyear’stotaloutputvalueofindustryandagriculturewillincrease5percentoverlastyears.
A.byB.toC.ofD.with
40.Maryisthetopstudentintheclass.Shestudiesharder.
A.thananystudentB.thanallthestudents
C.thananyotherstudentD.thansomeotherstudent
41.Manypeoplehaveappliedfortheposition.
A.emptyB.bareC.vacantD.blank
42.Mynewshoescostme50yuan(RMB).ThepricewasthatthelastpairIboughtamonthago.
A.twotimemorethanB.twiceasmuchas
C.astwiceD.asmuchastwice
43.Almosteveryonefailedonthefirstday.
A.passhisdriver’stestB.tohavepassedhisdriver’stest
C.topasshisdriver’stestD.passinghisdriver’stest
44.Overthetraditionalfestivalpeoplevisiteachotherandgreetings.
A.exchangeB.wishC.congratulateD.present
45.Itwasbecausehewastiredoutthathefellasleepstandingup.
A.publiclyB.openlyC.speciallyD.obviously
46.Theyoungmanwasaccusedoftheladyofhermoney.
A.stealingB.robbingC.takingD.grasping
47.NomatterwhereourPartyneedsus,wewillhercall.
A.giveanswerforB.respondto
C.haveresponsetoD.answerto
48.Itisastonishingthatapersonofyourintelligencebecheatedsoeasily.
A.couldB.shouldC.mightD.would
49.Wewerecompletelywhenwefinallyreachedthedestination.
A.wornoffB.worndownC.wornoutD.wornaway
50.Manythingsimpossibleinthepastarecommontoday.
A.consideredB.toconsiderC.consideringD.tobeconsidered
51.Notuntilmanyyearslaterknown.
A.wasthewholetruthbecomeB.didthewholetruthbecome
C.thewholetruthbecameD.thewholetruthhadbecame
52.Wedidn’tknowhistelephonenumber,otherwisewehim.
A.wouldtelephoneB.wouldhavetelephoned
C.hadtelephonedD.musthavetelephoned
53.Thereisnopointwithhim,sincehehasalreadymadeuphismind.
A.argueB.toargueC.inarguingD.ofarguing
54.Iappreciatethatletterforme.
A.youtowriteB.yourwritingC.youwriteD.thatyouwriting
55.I’dliketoaspecialseatfortheconnectofMay5.
A.serveB.reserveC.preserveD.conserve
56.thatsoniswellagain,younolongerhaveanythingtoworryabout.
A.SinceB.NowC.WhenD.After
57.Generallyspeaking,allkindsofmaterialswillexpandwhenheatedbutwillwhencooled.
A.contrastB.contractC.surviveD.return
58.Youwon’tknowifitfitsyouuntilyouiton.
A.willtryB.aretryingC.aretotryD.havetried
59.Afteralleffortsinvain,hehadtoaccepttheresult.
A.regularlyB.shallowlyC.physicallyD.painfully
60.Therestofhislifeistothecauseofinternationalexchangesofvisitingscholars.
A.addedB.putC.savedD.committed
Passage2
Questions6to10arebasedonthefollowingpassage:
Whenaluminumwasfirstproducedaboutahundredandfiftyyearsago,itwassodifficulttoseparateformtheoresinwhichitwasfoundthatitspricewashigherthanthatofgold.Thepriceremainedhighuntilanewprocesswasdiscoveredforrefiningthemetalwiththeaidofelectricityapproximatelythreequartersofacenturylater.Thenewmethodwassomuchcheaperthataluminumbecausepracticalformanypurposes,oneofwhichwasmakingpotsandpans.
Aluminumislightweight,rustproofandeasilyshapedintodifferentforms.Bymixingitwithothermetals,scientistshavebeenabletoproduceavarietyofalloys,someofwhichhavethestrengthofsteelbutweighonlyonethirdasmuch.
Today,theusesofaluminumareinnumerable.Perhapsitsmostimportantuseisintransportation.Aluminumisfoundintheengineofautomobiles,inthehullsofboats.Itisalsousedinmanypartsofairplanes.Infact,thehuge“airbus”planeswouldprobablyneverhavebeenproducedifaluminumdidnotexist.Bymakingvehicleslighterinweightaluminumhasgreatlyreducedtheamountoffuelneededtomovethem,Aluminumisalsobeingusedextensivelyinthebuildingindustryinsomecountries.
Sincealuminumissuchaversatile(多用的)metal,itisfortunatethatbauxite(铝土矿),whichisoneofitschiefsources,isalsooneoftheearth’smostplentifulsubstances.Asthesourceofaluminumisalmostinexhaustible,wecanexpectthatmoreandmoreuseswillbefoundforthisversatilemetal.
6.Thepriceofaluminumwassharplyreducedwhenpeoplediscoveredanewrefiningprocesswiththeaidof.
A.windB.solarenergyC.hydraulicpowerD.electricity
7.Aluminumis.
A.lightweight,rustproofbutnoteasilyshapedintodifferentforms
B.heavyweight,rustproofandeasilyshapedintodifferentforms
C.lightweight,rustproofandeasilyshapedintodifferentforms
D.lightweightandeasilyshapedintodifferentformsbutitiseasytobecomerusty
8.WhichofthefollowingisNOTtrue?
A.Aluminumiswidelyusedintransportation.
B.Aluminumisalsousedinmanypartsofairplanes.
C.Aluminumisbeingusedextensivelyinthebuildingindustry.
D.Aluminumisnotusedinitspureform.
9.Aluminumisfoundonearthmostlyintheformof.
A.puremetalB.bauxiteC.goldD.liquid
10.Whatisthepassagetalkingabout?
A.Thefeaturesofaluminumanditsfunctions.B.Theprocessofaluminum.
C.Thediscoveryofaluminum.D.Thepromisingfutureofaluminum.
Letchildrenlearntojudgetheirownwork.Achildlearningtotalkdoesnotlearnbybeingcorrectedallthetime;ifcorrectedtoomuch,hewillstoptalking.Henoticesathousandtimesadaythedifferencebetweenthelanguagesheusesandthelanguagethosearoundhimuse.Bitbybit,hemakesthenecessarychangestomakehislanguagelikeotherpeople.Inthesameway,whenchildrenlearntodoalltheotherthingstheylearntodowithoutbeingtaught-towalk,run,climb,whistle,rideabicycle-comparethoseperformanceswiththoseofmoreskilledpeople,andslowlymaketheneededchanges.Butinschoolwenevergiveachildachancetofindouthisownmistakesforhimself,letalonecorrectthem.Wedoitallforhim.Weactasifwethoughtthathewouldnevernoticeamistakeunlessitwaspointedouttohim,orcorrectitunlesshewasmadeto.Soonhebecomesdependentontheteacher.Lethimdoithimself.Lethimworkout,withthehelpofotherchildrenifhewantsit,whatthiswordsays,whatansweristothatproblem,whetherthisisagoodwayofsayingordoingthisornot.
Ifitisamatterofrightanswers,asitmaybeinmathematicsorscience,givehimtheanswerbook.Lethimcorrecthisownpapers.Whyshouldweteacherswastetimeonsuchroutinework?Ourjobshouldbetohelpthechildwhenhetellsusthathecan’tfindthewaytogettherightanswer.Let’sendthisnonsenseofgrades,exams,marks,Letusthrowthemallout,andletthechildrenlearnwhatalleducatedpersonsmustsomedaylearn,howtomeasuretheirownunderstanding,howtoknowwhattheyknowordonotknow.
Letthemgetonwiththisjobinthewaythatseemssensibletothem.Withourhelpasschoolteachersiftheyaskforit.Theideathatthereisabodyofknowledgetobelearntatschoolandusedfortherestofone’slifeisnonsenseinaworldascomplicatedandrapidlychangingasours.Anxiousparentsandteacherssay,“Butsupposetheyfailtolearnsomethingessentialtheywillneedtogetintheworld?”Don’tworry!Ifitisessential,theywillgooutintotheworldandlearnit.
1.Whatdoestheauthorthinkisthebestwayforchildrentolearnthings?
A.bycopyingwhatotherpeopledo.
B.bymakingmistakesandhavingthemcorrected.
C.bylisteningtoexplanationsfromskilledpeople.
D.byaskingagreatmanyquestions.
2.Whatdoestheauthorthinkteachersdowhichtheyshouldnotdo?
A.Theygivechildrencorrectanswers.
B.Theypointoutchildren’smistakestothem.
C.Theyallowchildrentomarktheirownwork.
D.Theyencouragechildrentomarktocopyfromoneanother.
3.Thepassagesuggeststhatlearningtospeakandlearningtorideabicycleare___.
A.notreallyimportantskills.
B.moreimportantthanotherskills.
C.basicallydifferentfromlearningadultskills.
D.basicallythesameaslearningotherskills.
4.Exams,grades,andmarksshouldbeabolishedbecausechildren’sprogressshouldonlybeestimatedby___.
A.educatedpersons.
B.thechildrenthemselves.
C.teachers.
D.parents.
5.Theauthorfearsthatchildrenwillgrowupintoadultswhilebeing___.
A.tooindependentofothers.
B.toocriticalofthemselves.
C.incapabletothinkforthemselves.
D.incapabletousebasicskills.
“Whatcoursesareyougoingtodonextsemester”
“Idon’tknow.Butit’sabouttime_____onsomething.”