题目内容：
根据以下材料，回答题
WhatIsaDream?
Forcenturies,peoplehavewonderedaboutthestrangethingsthattheydreamabout.Somepsychologistssaythatthisnighttimeactivityofthemindhasnospecialmeaning.Others,however,thinkthatdreamsareanimportantpartofourlives.Infact,manyexpertsbelievethatdreamscantellusaboutaperson'smindandemotions.Beforemoderntimes,manypeoplethoughtthatdreamscontainedmessagesfromGod.Itwasonlyinthetwentiethcenturythatpeoplestartedtostudydreamsinascientificway.
TheAustrianpsychologist,SigmundFreud,wasprobablythefirstpersontostudydreamsscientifically.Inhisfamousbook,TheInterpretationofDreams(1900),Freudwrotethatdreamsareanexpressionsofaperson'swishes.Hebelievedthatdreamsallowpeopletoexpressthefeelings,thoughts,andfearsthattheyareafraidtoexpressinreallife.TheSwisspsychiatristCarlJungwasonceastudentofFreud's.Jtmg,however,hadadifferentideaaboutdreams.Jungbelievedthatthepurposeofadreamwastocommunicateamessagetothedreamer.Hethoughtpeoplecouldlearnmoreaboutthemselvesbythinkingabouttheirdreams.Forexample,peoplewhodreamaboutfallingmaylearnthattheyhavetoohighanopinionofthemselves.Ontheotherhand,peoplewhodreamaboutbeingheroesmaylearnthattheythinktoolittleofthemselves.
Modern-daypsychologistscontinuetodeveloptheoriesaboutdreams.Forexample,psychologistWilliamDomhofffromtheUniversityofCalifornia,SantaCruz,believesthatdreamsaretightlylinkedtoaperson'sdailylife,thoughts,andbehavior.Acriminal,forexample,mightdreamaboutcrime.
Dornhoffbelievesthatthereisaconnectionbetweendreamsandage.Hisresearchshowsthatchildrendonotdreamasmuchasadults.AccordingtoDomhoff,dreamingisamentalskillthatneedstimetodevelop.
Hehasalsofoundalinkbetweendreamsandgender.Hisstudiesshowthatthedreamsofmenandwomenaredifferent.Forexample,thepeopleinmen'sdreamsareoftenothermen,andthedreamsofteninvolvefighting.Thisisnottrueofwomen'sdreams.Domhofffoundthisgenderdifferenceinthedreamsofpeoplefrom11culturesaroundtheworld,includingbothmodernandtraditionalones.
Candreamshelpusunderstandourselves?Psychologistscontinuetotrytoanswerthisquestionindifferentways.However,onethingtheyagreeonthis:Ifyoudreamthatsomethingterribleisgoingtooccur,youshouldn'tpanic.Thedreammayhavemeaning,butitdoesnotmeanthatsometerribleeventwillactuallytakeplace.It'simportanttorememberthattheworldofdreamsisnottherealworld.
AccordingtoSigmundFreud,dreams__________. A．havenospecialmeanings
B．reflectpeople'swishes
C．havenothingtodowithreallife
D．containmessagesfromGod
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