[完形填空]  Therearemoreantsthananyotherkindsoflandanimalsintheworld.Theyrangefrom0.1to1inchlongandareusuallyyellow,brown,red,orblack.Antsliveinsocietiesinwhichtheydependononeanother.Thesocietiesarenotallexactlythesamebecausethereareantsofverymanykinds.Butingeneral,eachkindhasantsofthreemaintypes:queens,males,andworkers.Theantshaveagoodmanyenemies.Theyincludebirds,bearsandanteatersofvariouskinds.Insomecasesotherantsaretheirworstenemies,asman’senemyisman.Insomepartsoftheworld,redantsmarchinlargearmiestoattackthehomesofblackants.Someofthemsucceedingettinginsideofthetunnelsofblackants,whoseentranceshavebeenblocked.Theytrytocarrytheblackantbabiesaway.Theblackantsdoalltheycantopreventthat.Theysendtheirbiggestsoldiersintoaction.Verymanyoftheredantssoldiersarekilledbutsomeescapewithbabiesbelongingtotheblackants.Theredantstakethebabieshomeandbringthemup.Theybecometheonlyworkersfortheredants.Antsasagrouparebeneficialtohumans.Theirtunnelsmixandsoftenthesoil,insomeplacesreplacingtheactivityofearthworms.Someofantsareharmfultohumans.Forexample,thefireant,whichhasapainfulbite,isaseriouspesttohumansanddomesticanimalsinmanypartsoftheworld.1.Whichkindofantsisnotregardedasthemaintypesofantsingeneral?A.Queenants.B.Soldierants.C.Workerants.2.Accordingtothepassage,whatdowelearnabouttheants’enemies?A.Theyareofmanykinds.B.Theyarebirdsandanteaters.C.Theyarethesameasman’senemies.3.Theredantsattacktheblackants’homebecause.A.blackantsarebettersoldiersB.redantsarestrongerthanblackantsC.theydon’thaveworkersoftheirown4.Accordingthepassage,whichofthefollowingstatementsisTRUE?A.Thenumberofantsisthemostintheworld.B.Eachantdependsuponitselfinthesociety.C.Antsareusefultohumanonsomeconditions.5.Themainpurposeofthepassageisto.A.explainsomeinformationaboutantsB.showthedifferencebetweenredantsandblackantsC.convincepeoplethatantsasagroupisbeneficialinsect