2020全国英语等级考试pets1级阅读理解题

2020全国英语等级考试pets1级阅读理解题SuperconductingMaterialsThestoneage，TheIronAge.Entireepochshavebeennamedformaterials.Sowhattocallthedecadesahead?Thechoicewillbetough.Welcometotheageofsuperstuff.Materialscience——oncetheleastsexytechnology-isburstingwithnew，practicaldiscoveriesledbysuperconductingceramicsthatmayrevolutionizeelectronics.Butsuperconductorsarejustpartofthepicture：fromhouseandcarstocookpotsandartificialteeth，theworldwillsomedaybemadeofdifferentstuff.Exoticplastics，glassandceramicswillshapethefuturejustassurelyashavegeneticengineeringandcomputerscience.Thekeytothenewmaterialsisresearchers‘increasingabilitytomanipulatesubstancesatthemolecularlevel.Ceramics，forexample，havelongbeenlimitedbytheirbrittleness.Butbyminimizingthemicroscopicimperfectionsthatcauseit，scientistsaremakingfarstrongerceramicsthatstillretainsuchqualitiesashardnessandheatresistance.FordMotorCo.nowusesceramictoolstocutsteel.AfirmcalledKyocerahascreatedalineofceramicscissorsandknivesthatstaysharpforyearsandneverrustorcorrode.Asimilartransformationhasovertakenplastics.High-strengthpolymersnowformbridges，ice-skatingrinksandhelicopterrotors.Andonenewplasticthatgenerateselectricitywhenvibratedorpushedisusedinelectricguitars，touchsensorsforrobothandsandkaratejacketsthatautomaticallyrecordeachpunchandchop.Evenplasticlitter，whichoncethreatenedtopermanentlyblotthelandscape，hasprovedamenabletomoleculartinkering.Severalmanufacturersnowmakebiodegradableforms;someplasticsix-packringsforexample，graduallydecomposewhenexposedtosunlight.Researchersaredevelopingwaystomakeplasticsasrecyclableasmetalorglass.Besides，composites-plasticreinforcedwithfibersofgraphiteorothercompounds-madetheround-the-worldflightofthevoyagerpossibleandhaveevenbeenprovedincombat：ahelmetsavedaninfantryman‘slifebydeflectingtwobulletsintheGrenadainvasion.Someadvancedmaterialsareoldstandardwithanewtwist.Thenewestfiberopticcablethatcarrytelephonecallscross-countryaremadeofglasssotransparentthatapieceof100milesthickisclearerthanastandardwindowpane.Butnewmaterialshavenoimpactuntiltheyaremadeintoproducts.Andthattransitioncouldprovedifficult，forswitchingrequireslengthyresearchandinvestment.Itcanbesaidafirmerhandleonhowtomovetocommercializationwilldeterminethesuccessorfailureofacountryinthenearfuture.1.Howmanynewmaterialsarementionedinthispassage?e答案：B三种超导材料。答案再段后一句“神奇的塑料、玻璃和陶瓷”。下面各段具体讲这三种材料。第二段讲陶瓷：“新材料之关键在于研究工作者不断提高在分子水平上处理物质的能力。举陶瓷为例，由于它的脆性，长期来应用范围有限。但是通过改善导致脆性的微小缺陷，科学家制造出一种保持原有硬度和抗热性，但坚实得多的陶瓷”。第三段讲塑料。“类似的转折发生在塑料上，高强度的塑料建成了桥梁、溜冰场、直升机的叶轮。一种震动或推动就能发电的新型塑料用于电子吉他上，触及传感塑料用于机械手和空手道外衣上，它能自动记录每次击打。”后面谈及塑料垃圾可以处理，或者制造可分解还原的塑料制品。塑料内加入其他化合物加强性能。第四段讲有些高级材料由新的改变，新的光纤电缆由玻璃制成，透明度极高，100英里厚的一块其清晰度比一块普通窗玻璃还高。2.Whydoestheauthormentiongeneticengineeringandcomputerscience?[A]Tocomparethemwiththenewmaterials.[B]Toshowthesignificanceofthenewmaterialsonthefutureworld.[C]Tocomparethenewmaterialstothem.[D]Toexplainhisviewpoint.答案：B说明这种新材料对未来世界的意义。答案在段：“神奇的塑料、玻璃和陶瓷一定会象生物工程和计算机一样将改变世界。”A.把它们和新材料相比较，这里不仅仅是比较，而是说明三者都具同样的作用——改变世界。C.把新材料比作它们。也不仅仅是比喻比拟。与A一样没有说到核心电。D.说明他的观点。太笼统。3.Whyistransitiondifficult?[A]Becausetransitionrequiresmoneyandtime.[B]Becausemanymanufacturersareunwillingtochangetheirequipment.[C]Becauseresearchonnewmaterialsisverydifficult.[D]Becauseittakes10years.A.在于研究答案：A转折需要钱和时间。见后一段“可是新材料只有制成产品才有影响，而这个转折可能很困难，因为转折需要长期的研究和投资。可以这么说，在不久的将来，更牢牢地掌握如何把材料转变成商品将决定一个国家之成败。”B.因为许多制造商不愿改变他们的设备。C.因为新材料的研究非常困难。D.转折要华上十年时间。这三项文内没有涉及。4.Whereliessuccessof