单元加餐练

Ⅰ.阅读理解

A

JustintimeforNationalPopcornDay,anewstudyshowsthatpeopleinwhatsnowPeruwereeatingthesnackabout2,000yearsearlierthanwethought.

Coastalpeopleswerepreparingcorn－basedfoodsupto6,700yearsago,accordingtoanalysisofremainsoftheancientcornrecentlydiscoveredattheParedonesandHuacaPrietaarchaeologicalsitesonPerusnortherncoast.

Previously,evidenceofcornasafoodabout5,000yearsagohadmostlycomefromwhatarecalledmicrofossils—microscopicremainsthatdonotofferinformationonthesizeandshapeofthecorncobs(玉米棒).Butthenewlyfoundcornremainsrevealedalot,viaradiocarbondatingandothertests.

ThepeoplewholivedinParedonesandHuacaPrietaprobablycookedcorninseveralways:Wrappingacorncobandrestingitoncoals,roastingacorncobdirectlyoveraflame,orcookingacorncobinanearthenoven.Inthisculture,cornwasadeliciousfoodoraminorsupplementtothediet-archaeologicalevidenceshowstheydidnoteatitinlargeamounts.

CornwasfirstgrowninMexicoabout9,000yearsagofromawildgrasscalledteosinte,accordingtoPiperno,whoseresearchhasbeenpublishedinthejournalProceedingsoftheNationalAcademyofSciences.Afewthousandyearslater,cornwasbroughttoSouthAmerica,wherefarmersbredtheplantcropintohundredsofvarieties.

Indeed,whatsurprisedPipernomostaboutthenewresearchwasthediversityofcorn—fromcorncobshapestokernel(玉米粒)colorsdiscoveredinthenew-foundremains.“Farmersliketoexperimentandgrowcoolthings，”shesaid.

篇章导读：本文是一篇说明文。一项新的考古研究发现人类在距今约6，700年前已开始食用玉米，比之前所认为的时间提前了约两千年。

1．Whatwouldbethebesttitleforthepassage?

A．Ancientpopcornwaseatenabout2,000yearsearlierthanthoughtinPeru

B．Anewdiscoveryrevealedthemysteryaboutcorn

C．HowwascorncookedinancientPeruandSouthAmerica?

D．NationalPopcornDayandthenew－foundcornremainsinPeru

答案：A标题判断题。由文章主旨段第一段并纵观全文可知，文章讲的是