培优练（五）　科技发明2025高考英语大二轮考前培优练外刊阅读热点话题练.DOCX

培优练（五）科技发明2025高考英语大二轮考前培优练外刊阅读热点话题练eq\a\vs4\al\co1(培优练（五）科技发明30分钟)

Ⅰ.阅读理解

Someday，youmaynolongerneedtobrushyourteethbyhand.Instead,agroupofbillionsofnanoparticles(纳米粒子)couldautomaticallydoallthatworkforyou.Itwouldbeespeciallylife－changingforpeoplewhofinditdifficultorimpossibletoholdandmoveatoothbrush.

Steager,anengineerattheUniversityofPennsylvania(Penn)inPhiladelphiaandHyunKoo,aninventoranddentalresearcherthere,foundawaytoformthenanoparticlesintolong,skinnybristles(刷毛),alotliketheonesonatoothbrush.Butthesebristlesshape－shifttofitwhateversurfacetheyencounter.

Thetooth－cleaningrobotworksthankstotwomagnets(磁铁).Onegoeseachsideoftheteeth.Thenanoparticlessitinaliquidbetweenthemagnets.Whenthemagnetsareturnedoff,thenanoparticlesmoverandomlyintheliquid.Assoonasonemagnetgetsturnedon,thenanoparticlesgathertogethernearitscenter.Whentheresearchersturnontheothermagnetandturnoffthefirstone,thenanoparticlesextendoutwardinlong,skinnybristles.Whenthere’satoothintheway,thesebristlescan’tstretchoutasfarastheywant.Sotheypushagainstthetooth’ssurface.Ifthere’sagapbetweenteeth,theypushintothegap.Movingthemagnetsmakesthebristlesmoveagainstandbetweenteeth.Allthatmotioncleanstheteeth.Asabonus,thenanoparticlesalsohavestrongpowertokillviruses.

Thenewdeviceisjustaproofofconcept.Theresearchersstillneedtoturnitintoaproductthatpeoplewillwanttouse.“There’salotofengineeringtogetfromheretothere,buteverygoodideaneedstohaveastart，”saidSteager.

【语篇解读】本文是说明文，主要讲述了美国宾夕法尼亚大学的研究人员研发出了一款纳米洁牙机器人。

1.Whatisspecialaboutthetoothcleaner?

A.It’swater－proof.

B.It’stransformable.

C.Itlookslikeatoothbrush.

D.Itcontainsskinnybristles.

答案B[细节理解题。根据第二段中的“Butthesebristlesshape－shifttofitwhateversurfacetheyencounter”可知，尽管这些刷毛和普通牙刷的无异，但这些