与X线对比度无关的因素足

A、X线波长
B、线吸收系数
C、增感屏增感系
D、人体组织的密度
E、人体组织的原子序数
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正确答案:

C

答案解析:

暂无解析

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PartIReadingComprehension

Directions:Inthisparttherearefourpassages.Eachpassageisfollowedbyfourcomprehensionquestions.Readthepassageandanswerthequestions.ThenmarkyouranswerontheAnswerSheet.

Passage1

Questions1to5arebasedonthefollowingpassage:

Askthreepeopletolookthesamewindowatabusystreetcornerandtellyouwhattheysee.Chancesareyouwillreceivethreedifferentanswers.Eachpersonseesthesamescene,buteachperceivessomethingdifferentaboutit.

Perceivinggoesoninourminds.Ofthethreepeoplewholookoutthewindow,onemaysaythatheseesapolicemangivingamotoristaticket.Anothermaysaythatheseesarush-hourtrafficjamattheintersection.Thethirdmaytellyouthatheseesawomantryingtocrossthestreetwithfourchildrenintow.Forperceptionisthemind’sinterpretationofwhatthesenses—inthiscaseoureyes—tellus.

Manypsychologiststodayareworkingtotrytodeterminejusthowapersonexperiencesorperceivestheworldaroundhim.Usingascientificapproach,thesepsychologistssetupexperimentsinwhichtheycancontrolallofthefactors.Bymeasuringandchartingtheresultsofmanyexperiments,theyaretryingtofindoutwhatmakesdifferentpeopleperceivetotallydifferentthingsaboutthesamescene.

1.Seeingandperceivingare.

A.thesameaction

B.twoseparateactions

C.twoactionscarriedonentirelybyeyes

D.severalactionsthattakeplaceatdifferenttimes

2.Perceivingisanactionthattakesplace.

A.inoureyes

B.onlywhenwethinkveryhardaboutsomething

C.onlyunderthedirectionofapsychologist

D.ineveryperson’smind

3.Peopleperceivedifferentthingsaboutthesamescenebecause.

A.theyseedifferentthingsB.somehavebettereyesight

C.theycannotagreeaboutthingsD.noneofthese

4.Whichofthefollowingisimpliedbutnotstatedinthepassage?

A.Psychologistsdonotyetknowpeoplesee.

B.Theexperimentsinwhichallfactorsarecontrolledarebetter.

C.Thestudyofperceptionisgoingonnow.

D.Perceptiondoesnotinvolvepsychologicalfactors.

5.Thebesttitleforthisselectionis.

A.HowWeSee

B.LearningaboutOurMindsthroughScience

C.WhatPsychologistsPerceive

D.HowtoBecauseanExperimentalPsychologist

Ineverregretted_____hisoffer,foritwasnotwheremyinterestlay.

A、nottoaccept
B、nothavingaccepted
C、havingnotaccepted
D、notaccepting

Thismissileisdesignedsothatonce_____nothingcanbedonetoretrieveit.

A、fired
B、beingfired
C、theyfired
D、havingfired

翻译:

最近,一些地方大学开始将方言列为某些学生的必修课程,学生们要学习当地方言,然后被评分以作为毕业的依据之一。一方面,支持此种做法的人认为,将方言列为必修课可防止其消失,从而使当地传统文化和文化多样性得以弘扬,同时城市独特的个性得以保留。另一方面,反对此种做法的人争论说,当地学生与外地学生相比有很多绝对优势,因此将方言列为必修课会引起教育不公平的问题。而且,将方言列为必修课程还会引起一些其他问题,如教材使用、师资问题和考试标准等。在我看来,方言作为传统文化不可缺少的一部分和一种交流工具,可以让学生自愿学习和使用,而不是强制完成。

Evenasagirl,_____tobeherlife,andtheateraudiencesweretobeherteachers.

A、performingbyMelissawere
B、itwasknownthatMelissa'sperformanceswere
C、knowingthatMelissa'sperformanceswere
D、Melissaknewthatperformingwas
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