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期望理论中队“效价”的正确理解是（）
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据考古发现，我国陕西省半坡原始村落建在河谷阶地上，图甲为半坡原始村落复原模型，图乙为河谷阶地示意图。半坡原始村落选择建在河谷阶地上，考虑的主要因素有（） ①接近水源 ②安全防卫 ③对外联系便利 ④地势较高，免受洪涝之害
在下图所示电路中，电源电压U=6V。若使电阻R上的电压U1=4V，则电阻R为（）。
Whichofthefollowingisnotadesignfeatureofhumanlanguage?（）
Questions11to15arebasedonthefollowingpassage.Scratchythroats,stuffynosesandbodyachesallspellmisery,butbeingabletotellifthecauseisacoldorflu(流感)maymakeadifferenceinhowlongthemiserylasts.TheAmericanLungAssociation(ALA)hasissuednewguidelinesoncombatingcoldsandtheflu,andoneofthekeysisbeingabletoquicklytellthetwoapart.That’sbecausetheprescriptiondrugsavailableforthefluneedtobetakensoonaftertheillnesssetsin.Asforcolds,thesoonerapersonstartstakingover-the-counterremedy,thesoonerreliefwillcome.Thecommoncoldandthefluarebothcausedbyviruses.Morethan200virusescancausecoldsymptoms,whilethefluiscausedbythreeviruses—fluA,BandC.Thereisnocureforeitherillness,buttheflucanbepreventedbythefluvaccine(疫苗),whichis,formostpeople,thebestwaytofighttheflu,accordingtotheALA.Butifthefludoesstrike,quickactioncanhelp.Althoughthefluandcommoncoldhavemanysimilarities,therearesomeobvioussignstolookfor.Coldsymptomssuchasstuffynose,runnynoseandscratchythroattypicallydevelopgradually,andadultsandteensoftendonotgetafever.Ontheotherhand,feverisoneofthecharacteristicfeaturesofthefluforallages.Andingeneral,flusymptomsincludingfeverandchills,sorethroatandbodyachescomeonsuddenlyandaremoreseverethancoldsymptoms.TheALAnotesthatitmaybeparticularlydifficulttotellwheninfantsandpreschoolagechildrenhavetheflu.Itadvisesparentstocallthedoctoriftheirsmallchildrenhaveflu-likesymptoms.Bothcoldandflusymptomscanbeeasedwithover-the-countermedicationsaswell.However,childrenandteenswithacoldorflushouldnottakeaspirinforpainreliefbecauseoftheriskofReyesyndrome(综合症)，ararebutseriousconditionoftheliverandcentralnervoussystem.Thereis,ofcourse,novaccineforthecommoncold.Butfrequenthandwashingandavoidingclosecontactwithpeoplewhohavecoldscanreducethelikelihoodofcatchingone.Ifchildrenhaveflu-likesymptoms,theirparents（）
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