EvEry womAn DrEAms oF rECEiving A hugE priCElEss DiAmonD、now spACE sCiEntists{{u}} 21 {{/u}}thAt thEy hAvE DisCovErED thE lArgEst DiAmonD in thE univErsE.But it’s wEll{{u}} 22 {{/u}}thE rEACh oF thE most lovEstruCk mEn BECAusE it’s 50 light yEArs AwAy, to BE{{u}} 23 {{/u}}. mEAsuring 2,500 milEs ACross AnD wEighing FivE million trillion trillion pounDs, thE roCk wAs FounD on vAlEntinE’sDAy{{u}} 24 {{/u}}in thE CorE oF A whitE DwArF stAr, AnD it hAs ExCitED thE{{u}} 25 {{/u}}worlD、 "it’s thE mothEr oF All DiAmonDs, "sAiD trAvis mEtCAlFE,{{u}} 26 {{/u}}lED thE tEAm oF rEsEArChErs At thE hArvArD-smithsoniAnCEntrE ," AnD you woulD nEED A jEwElEr’s loupE(用专放大镜), thE sizE oF thE sun, to{{u}} 27 {{/u}}this DiAmonD、" thE lArgEst DiAmonD{{u}} 28 {{/u}}on EArth wAs thE 3,106-CArAt(克拉)CullinAn. it wAs Cut{{u}} 29 {{/u}}ninE mAjor stonEs, inCluDing thE 530-CArAt stAr oFAFriCA, now A pArt oF thECrown jEwEls.DiAmonDs wErE{{u}} 30 {{/u}}DisCovErED in inDiA morE thAn 2,800 yEArs Ago. thEAnCiEnt romAns{{u}} 31 {{/u}}thAt thE stonEs wErE BrokEn piECEs oF stArs thAt hAD{{u}} 32 {{/u}}to EArth. inAnCiEntEgypt, DiAmonDs wErE usED in FunErAls. in thE miDDlEAgEs, mEn{{u}} 33 {{/u}}thEm to symBolizE thEir CourAgE AnD strEngth. thE{{u}} 34 {{/u}}oF giving thEm As prEsEnts DAtEs From 1477,{{u}} 35 {{/u}}mAximiliAn, thE prinCE oFAustriA, gAvE A DiAmonD ring to mAry oFBurgunDy.

A．prACtiCE
B、trADition
C．hABit
D．CulturE