阅读C 08 8月底考试题 08 8月底考试题

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1、COneofthenation’stopcancersurgeons(外科医生)hasjustbecomealittlebitbetter,andallittookwasfixinganewbrain.Thesurgeon,knownasCyberKnife,isarobot.Alreadyskillfulatattackingbraintumors（瘤）,CyberKnifereceivedanewcomputersoftwaretomoreefficientlytarget(对准)movinglungtumors.CyberKnifewa

2、sdevelopedtoexactlyfindtumorsandattackthemfromeveryanglewithradiation,thegoalbeingtolimittheattacktocanceroustissue(癌组织)only.Ifallgoeswell,afterseveraltreatmentsthetumordisappearsasifitweresurgicallyremoved,yethealthytissuesthatmightbedamagedevenbythequickhandsofaskilledhum

3、ansurgeonarespared.Now,CihatOzhasogluoftheUniversityofPittsburghhasdevelopedSynchrony,anadd-onprogramforCyberKnifethatallowsittofollowthetumortowithinafewhundredthsofaninchasitmoves.AsCyberKnifetrainsitsstrongX-raybeamonthetumor,anotherweakerX-raysourcetakespicturesofthepat

4、ient’sbody.Synchronyrecordsthetumor’smovementsandtellsCyberKnifewhenandwheretodirectthetherapeuticbeam(治疗光束).Patientsneedonlyonetothree60to90-minuteperiodsratherthanthe20to3015-minutevisitsrequiredwithregulartreatments.Treatingthetumoratahigherdose(剂量)forlongertimecausesthe

5、growthtoabsorb10timesmoretissue-killingradiationthanregulartreatments.“We’renotjusttryingtosavepatientstime.Themaingoaliswe’rehopingtobemoreeffective,”Ozhasoglusaid.“Bygivingamuchhigherdoseinashorterperiodwe’rehopingtohavehighercurerates.”Thefirstyearoftesttreatmentshasshow

6、npositiveresults,butitisstilltooearlytodetermineifthetechniqueistotallykillingtumorsorifthereareotherlong-termeffects.51.It’sdifficultforsurgeonstotreattumorsbecausetumorsare________.A.disappearingquicklyB.toosmallC.alwaysmovingD.againstradiation52.Whichofthefollowingisinch

7、argeofthetumor’smovementsduringtreatment?A.SynchronyB.ThestrongX-raybeamC.CyberKnifeD.TheweakerX-raybeam53.Ifpossible,comparedwiththeregulartreatment,treatingthetumorusingCyberKnifeandSynchronycansave_______atmost.A.20hoursB.45minutesC.220minutesD.6.5hours54.Accordingtothep

8、assage,wecaninferthat________.A.SynchronywillbewidelyusedinhospitalssoonB.theeffec