21、ely立即；intermi仕enfly间歇地；intensively强烈地。水力电站可以持续供电，而潮汐电站不同于水力电站，潮汐电站不能持续供电，只能间隙性供电，故选C。材料题根据以下材料，回答21-21题Inflationhasjustexploded.Therealproblemisthatwehaveanunderlyingrateofinflation-animpetusofwageschasingprices-ofmaybe9percentthatisheadingtowards10percent.Therealsohav
22、ebeentremendousshocksinenergy,foodandhousingprices,makingitworse.Bytheendoftheyear,wewillbeinasituationwhereyearin,yearout,wecanlookfoinvardtoatleast10percentinflation.Andthequestionwillbe:Howmuchworsewilloil,foodandhousingpricesmakethatThesituatio
24、inflationpressesfurtherandisevenmoredifficulttodealwith.Youhavetostartwithrevenueandmonetaryrestraint.Alltheburdennowisonmonetarypoli-cy.Weshouldshifttoamuchmorerestrictiverevenuepolicyandaneasiermonetarypolicy.tobesignificant,the1981budgetshouldbecut
43、rywasmildcomparedtothetrans-AtlanticslavetradeorganizedbytheEuropeans.Thisargument,however,canbecarriedtoofar.Inthemostrecentstudyofthissubject,somescholarswarnedagainsttheillusionthat"cruelanddehumanizingenslavementwasamonopolyoftheWest.Slaveryinits
44、extremeforms,includingthetakingoflife,wascommontobothAfricaandtheWest.ThefactthatAfricanslaveryhaddifferentoriginsandconsequencesshouldnotleadustodenywhatitwas-theexploitationandcontrolofhumanbeings."Neithercanitbedeniedthatthewholesaleshipmentof
45、AfricanstotheslaveplantationsoftheAmericaswasmadepossiblebytheparticipationofAfricanchiefswhoroundeduptheirfellowAfricansandsoldthemasahandsomeprofittoEuropeanshipcaptainswaitingalongthecoasts.Grantingallthis,thefactremainsthatthetrans-Atlanticslavetrade
46、conductedbytheEuropeanswasentirelydifferentinquantityandqualityfromthetraditionaltypeofslaverythathadexistedwithinAfrica.FromthebeginningtheEuropeanvarietywasprimarilyaneconomicinstitutionratherthansocial,asithadbeeninAfrica.Westernslavetradersandslaveowne
47、rswereactedonbypurelyeconomicconsiderations,andwerequitereadytoworktheirslavestodeathifitwasmoreprofitabletodosothantotreatthemmoremercifully.ThisinhumanitywasreinforcedbyracismwhentheEuropeansbecameinvolvedintheAfricanslavetradeonalargescale.Perhaps
67、ibodiestothevirus.sointestcoopsscatteredacrossthestate,morethan2000"sentinelchickens"submittofrequentbloodtests.Whenantibodiesdoturnup,Californiahealthofficialswillknowthattheinevitablehasoccurred:theWestNileepidemicwillhavesweptthecountry.Lastweek
68、alone,morethan100newhumancasesofWestNilewerereported.TheviruswasdetectedasfarwestasColoradoandWyoming,infecting371andkilling16peoplein20statesplustheDistrictofColumbia.ThisyearWestNileappearedearlierinthemosquitoseason-mid-JuneinsteadofAugust-andclaim