职称英语考试《理工类》章节练习题精选及答案051670.docx
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职称英语考试《理工类》章节练习题精选及答案051670.docx
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职称英语考试《理工类》章节练习题精选及答案051670
职称英语考试《理工类》章节练习题精选及答案0516-70
1、BlackHoles
Mostscientistsagreethatblackholesexistbutarenearlyimpossibletolocate.Ablackholeintheuniverseisnotasolidobject,likeaplanet,butitisshapedlikeasphere(球体).Astronomers(天文学家)thinkthatatthecenterofablackholethereisasinglepointinspacewithinfinite(无限的)density(稠密).
Thissinglepointiscalledasingularity(奇点).Ifthesingularitytheoryiscorrect,itmeansthatwhenamassivestarcollapses,allthematerialinitdisappearsintothesingularity.Thecenterofablackholewouldnotreallybeaholeatall,butaninfinitelydensepoint.Anythingthatcrossestheblackholeispulledinbyitsgreatgravity.
Althoughblackholesdoexist,theyaredifficulttoobserve.Thesearethereasons,
?
Nolightoranythingelsecomesoutofblackholes.Asaresult,theyareinvisibletoatelescope.
?
Inastronomicalterms,blackholesaretruly.Forexample,ablackholeformedbythecollapseofagiantstarwouldhaveaneventhorizon(视界)only18milesacross.
?
ThenearestblackholeswouldbedozensoflightyearsawayfromEarth.Onelightyearisabout6trillion(万亿)miles.Eventhemostpowerfultelescopescouldnotpickoutanobjectsosmallatsuchagreatdistance.
In1994theHubbleSpaceTelescopeprovidedevidencethatblackholesexist.Therearestillanswerstobefound,however,soblackholesremainoneofthemysteriesoftheuniverse.(2007年)
Blackholesexistbutaredifficulttoobserve.
【单选题】
A.Right
B.Wrong
C.Notmentioned
正确答案:
A
答案解析:
题干大意:
黑洞是存在的,但是很难观察到。
题干中的关键词为difficult,用它回到原文定位,在首句能找到difficult的近义词impossible。
文章首句提到:
Mostscientistsagreethatblackholesexistbutarenearlyimpossibletolocate.黑洞确实存在,但很难定位(locate),与题意信息相符,故答案选A。
2、EasyListening
Studentsshouldbejealous.Notonlydobabiesgettodozetheirdaysaway,butthey'vealsomasteredthefineartoflearningintheirsleep.
Bythetimebabiesareoneyearold,theycanrecognizealotofsoundsandevensimplewords.MarieCheourattheUniversityofTurkuinFinlandsuspectedthattheymightprogressthisfastbecausetheylearnlanguagewhiletheysleepaswellaswhentheyareawake.
Totestthetheory,Cheourandtheircolleaguesstudied45newbornbabiesinthefirstdaysoftheirlives.TheyexposedalltheinfantstoanhourofFinnishvowelsoundsonethatsoundslike"oo";anotherlike"ee"andthethirdboundaryvowelpeculiartoFinnishandsimilarlanguagesthatsoundslikesomethinginbetween.EEG(脑电图)recordingoftheinfantsbrainsbeforeandafterthesessionshowedthatthenewbornscouldnotdistinguishthesounds.
Fifteenofthebabiesthenwentbackwiththeirmothers,wheretherestweresplitintotwosleep-studygroups.Onegroupwasexposedthroughouttheirnight-timesleepinghourstothesamethreevowels,whiletheotherslistenedtotheother,easier-to-distinguishvowelsounds.
Whentestedinthemorning,andagainintheevening,thebabieswho'dheardthetrickyboundaryvowelsallnightshowedbrainwaveactivityindicatingthattheycouldnowrecognizethissound.Theycouldidentifythesoundevenwhenitspitchwaschanged,whilenoneoftheotherbabiescouldpickuptheboundaryvowelatall.
Cheourdoesn'tknowhowbabiesaccomplishthisnighttimelearning,butshesuspectsthatthespecialabilitymightindicatethatunlikeadults,babiesdon't"turnoff"theircerebralcortex(大脑皮层)whiletheysleep:
Theskillprobablyfadesinthecourseofthefirstyearsoflife,sheaddssoforgettheideathatyoucanpickupthetrickyFrenchvowelsasanadultjustbyslippingalanguagetapeunderyourpillow.Butwhileitmaynothelpgrown-ups,Cheourishopingtousethesleepinghourstogiveremedialhelptobabieswhoaregeneticallyatriskoflanguagedisorders.
Ifanadultwantstolearnalanguagefaster,hecanputalanguagetapeunderhispillow.
【单选题】
A.Right
B.Wrong
C.Notmentioned
正确答案:
B
答案解析:
这个命题是错误的。
文章最后一段有“Theskillprobablyfadesinthecourseofthefirstyearsoflife,sheaddssoforgettheideathatyoucanpickupthetrickyFrenchvowelsasanadultjustbyslippingalanguagetapeunderyourpillow.Butwhileitmaynothelpgrown-ups”,这些话都是对本题的否定。
3、RadiocarbonDating
Nowadaysscientistscananswermanyquestionsaboutthepastthroughatechniquecalledradiocarbon(放射性碳),orcarbon-14dating.Onekeytounderstandinghowandwhysomethinghappenedistodiscoverwhenithappened.
Radiocarbondatingwasdevelopedinthelate1940sbyphysicistWillardF.LibbyattheUniversityofChicago.Anatomofordinarycarbon,calledcarbon-12,hassixprotons(质子)andsixneutrons(中子)initsnucleus(原子核).Carbon-14,orC-14,isaradioactive,unstableformofcarbonthathastwoextraneutrons.Itreturnstoamorestableformofcarbonthroughaprocesscalleddecay(衰减).Thisprocessinvolvesthelossofth
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