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1、Week12 TuesdayTask1：阅读下列短文，从每题所给的四个选项(A、B、C和D)中，选出最佳选项。(2012·江苏，C)Medicaldrugssometimescausemoredamagethantheycure.Onesolutiontothisproblemistoputthedrugsinsideacapsule,protectingthemfromthebody—andthebodyfromthem—untiltheycanbereleasedatjusttherightspot.Therearelotsofwaystotrigger(引发)thisrelease,in
2、cludingchangingtemperature,acidity,andsoon.Buttriggerscancomewiththeirownrisks—burns,forexample.Now,researchersinCaliforniahavedesignedwhatcouldbeaharmlesstriggertodate:shiningnear－infraredlight(NIR,近红外线)onthedruginthecapsule.Theideaofusinglighttoliberatethedruginthecapsuleisn’tnew.Researchersaround
3、theglobehavedevelopedpolymers(聚合物)andothermaterialsthatbegintobreakdownwhentheyabsorbeitherultraviolet(UV,紫外线)orvisiblelight.ButtissuesalsoreadilyabsorbUVandvisiblelight,whichmeansthedrugreleasecanbetriggeredonlyneartheskin,wherethelightcanreachthecapsule.NIRlightlargelypassesthroughtissues,soresear
4、chershavetriedtouseitasatrigger.Butfewcompounds(化合物)absorbNIRwellandgothroughchemicalchanges.ThatchangedlastyearwhenAdahAlmutairi,achemistattheUniversityofCalifornia,SanDiego,reportedthatsheandhercolleagueshaddesignedapolymerthatbreaksdownwhenitabsorbsNIRlight.TheirpolymerusedacommerciallyavailableN
5、IR－absorbinggroupcalledo－nitrobenzyl(ONB)．Whentheycatchthelight,ONBgroupsfalloffthepolymer,leadingtoitsbreakdown.ButONBisonlyaso－soNIRabsorber,anditcouldbepoisonoustocellswhenitseparatesfromthepolymer.SoAlmutairiandhercolleaguesreportedcreatinganewmaterialforcapsulesthat’sevenbetter.Thisoneconsistso
6、falongchainofcompoundscalledcresolgroupslinkedinapolymer.Cresolcontainsreactive(易反应的)componentsthatmakeithighlyunstableinitspolymericform,afeatureAlmutairiandhercolleaguesusetotheiradvantage.Afterpolymerizingthecresols,theycapeachreactivecomponentwithalight－absorbingcompoundcalledBhc.WhentheBhcsabso
7、rbNIRlight,thereactivegroupsareexposedandbreakthelongpolymerintotwoshortchains.Shiningadditionallightcontinuesthisbreakdown,potentiallyreleasinganydrugsinthecapsule.What’smore,Almutairisays,Bhcis10tim
