WhenaSwedishshipthatsankin1628wasrecoveredfromtheportofStockholmhistoriansandscientistswereoverjoyedwiththechancetoexaminetheremainsofthepast.Theshipconstructionshowedhowshipswerebuiltandoperatedduringtheseventeenthcentury.Inthiswayartifactsobjectsmadebyhumanbeingsprovidedapictureofdailylifealmost400yearsago.

Underwaterarchaeology__thestudyofshipsaircraftandhumansettlementsthathavesunkunderlargebodiesofwaterisreallyaproductofthelast50years.Therapidgrowthofthisnewareaofstudyhasoccurredbecauseoftheinventionofbetterdivingequipment.BesidestheSwedishshipwreck(残骸）underwaterarchaeologistshavemademoreexcitingdiscoveriessuchasthe 5000-year-oldboatsintheMediterraneanSea.

Underwaterarchaeologycanprovidefactsaboutthepast.Inancientportsallovertheworldareshipssunkeninthepast6000years.Therearealsosunkensettlementsinseasandlakestellingofpeoplewayoflifeandtheirsystemsoftradeinancienttimes.Underwaterarchaeologistswanttostudytheseobjectstoaddtotheworld’sknowledgeofhistorybuttheyhavetofighttwoenemies.Oneenemyistreasurehunterswhodiveforancientartifactsthattheycanselltocollectors.Oncesoldtheseobjectsarelosttoexperts.Thesecondenemyisdredgingmachines(挖掘机）oftenusedtorepairports.Thesemachinesdestroywrecksandartifactsorburythemdeeperundersandandmud.Byteachingthepublicabouttheimportanceofunderwater“museums”ofthepastarchaeologistsarehopingtogetsupportforlawstoprotectunderwatertreasures.

1.WhatpurposedoesParagraph1serveinthepassage?

A.Toprovidebackgroundinformationofthetopic

B.Toattractreaders’attentiontothetopic

C.Touseanexampletosupportthetopic

D.Toofferbasicknowledgeofthetopic

2.Theaimofunderwaterarchaeologyisto .

A.exploitwaterbodies

B.searchforunderwaterlife

C.studyunderwaterartifacts

D.examineunderwaterenvironment

3.Underwaterarchaeologistsareworriedbecause_____.

A.seahuntershavebetterdivingequipment

B.theirknowledgeofworldhistoryislimited