高考英语（江苏专用 译林）复习：真题研练 week 12　tuesday含解析.docVIP

Week12Tuesday

Task1：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,includingchangingtemperature,acidity,andsoon.Buttriggerscancomewiththeirownrisks—burns,forexample.Now,researchersinCaliforniahavedesignedwhatcouldbeaharmlesstriggertodate:shiningnear－infraredlight(NIR,近红外线)onthedruginthecapsule.

Theideaofusinglighttoliberatethedruginthecapsuleisn’tnew.Researchersaroundtheglobehavedevelopedpolymers(聚合物)andothermaterialsthatbegintobreakdownwhentheyabsorbeitherultraviolet(UV,紫外线)orvisiblelight.ButtissuesalsoreadilyabsorbUVandvisiblelight,whichmeansthedrugreleasecanbetriggeredonlyneartheskin,wherethelightcanreachthecapsule.NIRlightlargelypassesthroughtissues,soresearchershavetriedtouseitasatrigger.Butfewcompounds(化合物)absorbNIRwellandgothroughchemicalchanges.

ThatchangedlastyearwhenAdahAlmutairi,achemistattheUniversityofCalifornia,SanDiego,reportedthatsheandhercolleagueshaddesignedapolymerthatbreaksdownwhenitabsorbsNIRlight.TheirpolymerusedacommerciallyavailableNIR－absorbinggroupcalledo－nitrobenzyl(ONB)．Whentheycatchthelight,ONBgroupsfalloffthepolymer,leadingtoitsbreakdown.ButONBisonlyaso－soNIRabsorber,anditcouldbepoisonoustocellswhenitseparatesfromthepolymer.

SoAlmutairiandhercolleaguesreportedcreatinganewmaterialforcapsulesthat’sevenbetter.Thisoneconsistsofalongchainofcompoundscalledcresolgroupslinkedinapolymer.Cresolcontainsreactive(易反应的)componentsthatmakeithighlyunstableinitspolymericform,afeatureAlmutairiandhercolleaguesusetotheir