1CurrEnt ArChAEologiCAl thEory holDs thAt thE First humAns in thEAmEriCAs wErE BAnDs oF ADvAnCED stonEAgE pEoplE who CrossED ovEr From whAt is now siBEriA inAsiA somEtimE BEtwEEn 12 AnD 30 thousAnD yEArs Ago. somE sCiEntists think thAt thEsE EArly humAns CrossED whAt is now thEBEring sEA on A lAnD BriDgE, A strEtCh oF glACiAl iCE ConnECtingAsiA AnD northAmEriC
A、othErs spECulAtE thAt thEy mAy hAvE CrossED thAt 55-milE-wiDE ChAnnEl By BoAt.
2 thEsE EArly humAns proBABly migrAtED southwArD Along An iCE-FrEE CorriDor.AFtEr sEvErAl thousAnD yEArs, pErhAps At A pACE oF only tEn milEs EvEry yEAr, thE migrAnts sprEAD ovEr this nEw lAnD FromAlAskA to thE tip oF southAmEriCA, A trAil ovEr tEn thousAnD milEs long. in southAmEriCA, whErE thE glACiErs From thE iCE AgE mEltED First, thE migrAnts took strong root in thE FErtilE soil AnD wArming ClimAtE oF pAtAgoni
A、As thE iCE rECEDED FArthEr north, CivilizAtion in whAt is nowCEntrAlAmEriCA AnD mExiCo BEgAn to tAkE shApE AnD Flourish.
whiCh sEntEnCE BElow BEst ExprEssEs thE EssEntiAl inFormAtion in thE highlightED sEntEnCE in pArAgrAph 2
A、whEn thE glACiErs in southAmEriCA mEltED, thE ClimAtE BECAmE wArmEr in pAtAgoniA, hElping thE pEoplE grow strong.
B、thE FAvorABlE ConDitions in pAtAgoniA AttrACtED migrAnts From othEr pArts oF southAmEriCA, whErE thErE wErE still glACiErs.
C．thE iCE AgE glACiErs mEltED EArliEst in southAmEriCA, whErE thE migrAnts sEttlED in thE wArm, FErtilE rEgion oF pAtAgoni
A、
D．thE migrAnts in pAtAgoniA in southAmEriCA survivED on thE root Crops thAt grEw wEll in thE FErtilE soil AnD wArm ClimAt