题目内容：
Questionsarebasedonthefollowingpassage.
Thegreatestrecentsocialchangeshavebeeninthelivesofwomen．Duringthetwentiethcenturytherehasbeenaremarkableshorteningoftheproportionofawoman'slifespentincaringforchiIdren．Awomanmarryingattheendofthe19thcenturywouldprobablyhavebeeninhermiddletwenties,and~vouldbelikelytohavesevenoreightchildren,ofwhomfourorfivelivedtilltheywerefiveyearsold．Bythetimetheyoungestwasfifteen,themotherwouldhavebeeninherearlyfiftiesandwouldexpecttoliveafurthertwentyyears,duringwhichcustom,opportunityandhealthmadeitunusualforhertogetpaidwork．Todaywomenmarryyoungerandhavefewerchildren．Usuallyawoman'syoungestchildwillbefifteenwhensheisforty-fiveyearsandislikelytotakepaidworkuntilretirementatsixty．Evenwhileshehasthecareofchildren,herworkislightenedbyhouseholdappliancesandconvenientfoods.
Afewyearsagomostgirlsleftschoolatthefirstopportunity,andmostofthemtookafull-timejob．However,whentheymarried,theyusuallyleftworkatonceandneverreturnedtoit．Todaytheschoolleavingageissixteen,manygirlsstayatschoolafterthatage,andthoughwomentendtomarryyounger,moremarriedwomenstayatworkatleastuntilshortlybeforetheirfirstchildisborn．Manyafterwardsreturntofullorpart-timework．Suchchangeshaveledtoanewrelationshipinmarriage,withthehusbandacceptingagreatershareofthedutiesandsat'isfactionsoffamilylife,andwithbothhusbandandwifesharingmoreequallyinprovidingthemoney,andrunningthehome.
Accordingtothepassage,aroundtheyear1900mostwomenmarried__________. A．atabouttwenty-five
B．intheirearlyfifties
C．assoonaspossibleaftertheywerefifteen
D．atanyagefromfifteentoforty-five
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答案解析：