1.Althoughthesunistheprimemoverofourweather,itisforeverunpredictable.
(A)primary(B)first-rate(C)first
2.Seamounts(海山),conicalelevationsformedbeneaththeocean,arethemostprominentformationsontheoceanbottom.
(A)battered(B)ancient(C)conspicuous
3.ItisgenerallybelievedthattheprincipalancestorofthedomesticcatistheLibyandesertcat.
(A)chief(B)official(C)only
4.GeneticistBarbaraMcClintockdiscoveredthatgenes,whichprescribethefunctionofcellsinplantsandanimals,canmoveinunpredictableways.
(A)inhibit(B)mimic(C)dictate
5.Becauselighttravelsmorequicklythansound,arumbleofthunderneverprecedesaboltoflightning.
(A)follows(B)accompanies(C)comesbefore
6.TheSocialInsuranceNumber(SIN)cardistheprimarymodeofidentificationforCanadians.
(A)principal(B)original(C)prior
7.Priortotheuseofnickelin1835,spoonsweremadeexclusivelyofsilverorpewter.
(A)Before(B)In(C)Atthetimeof
8.ThepreliminarycarvingofIroquois(易洛魁族人)maskswasdoneonlivingtreesbecauseitwasbelievedthatbythismeansthemaskswouldalsohavelife.
(A)initial(B)ceremonial(C)careful
9.Thebiologistneededmoreproofbeforehertheorycouldbeaccepted.
(A)financing(B)publications(C)evidence
10.WhenDavidcamelate,theteacherwarnedthathemustbeprompt.
(A)precise(B)opportune(C)punctual