题目内容：
根据以下材料，回答题Ahouseisthemostexpensivethingmostpeoplewilleverbuy.Veryfewpeoplehaveenoughmoneyoftheirowntobuyahouse,sotheyhavetoborrowmoneyfromabank.Borrowingmoneyfromabanktobuyahouseiscalled"takeamortgage".Thebankusuallylendsmoneyorgivesamortgagefortwenty-fiveyears.Housesaresoexpensivethatmanypeoplenowadayshavetoborrowasmuchas$50000.Inotherwords,theywillhavea$50000mortgage.
Howcanyougetamortgage?Whenyoufindahouseyoulike,yougotoabank.Thebankwillresearchyoufinancialhistoryanddecideiftheythinkyouareagoodrisk.Theywillwanttoknowwhatkindofjobyouhave,whatkindofsalaryyoumakeandhowlongyouhavehadthejob.Theywillalsowanttoknowhowmuchmoneyyouhave.Inaddition,thebankswillrequireadownpayment.Dependingonwhichstateyoulivein,thebankmayrequireasmuchas30%ofthepriceofthehouseasadownpayment.Thebankwillthenlendyoutherestofthemoneytobuythehouse.Manypeopleareneverabletobuyahousebecausetheycannotsaveenoughmoneyforthedownpayment.
WhatdoesahousemeanintheUnitedStates?______ A．Itisadreamwhichmanypeoplecanhardlyrealize
B．Itissoexpensivethatmanypeoplecannotreallybuythem
C．Itisthemostimportantpropertythatmanypeopletrytobuy
D．Itdoesn'tbelongtopeopleiftheycannotborrowmoneyfromthebank
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