题目内容：
DHowisitthatsiblings(兄弟姐妹)canturnoutsodiffcrcntly?Oneansweristhatinfacteachsiblinggrowsupinadifferentfamily.Thefirstbornis,forawhile,anonlychild,andthereforehasacompletelydifferentexperienceoftheparentsthanthosebornlater.Thenextchildis,forawhile,theyoungest,untilthesituationischangedbyanewarrival.Themotherandfatherthemselvesarcchangingandgrowinguptoo.Onesiblingmightliveinastableandclosefamilyinthefirstfewyears;anothermightberaisedinafamilycrisis,withadisappointedmotheroran
angryfather.
Siblingcompetitionwasidentifiedasanimportantshapingforceasearlyasin1918.Butmorerecently,researchershavefoundmanywaysinwhichbrothersandsistersarealastingforceineachothers'lives.Dr.AnnetteHendersonsaysfirstbornchildrenpickupvocabularymorequicklythantheirsiblings.Thereasonforthismightbethatthelaterchildrenaren'tgettingthesameone-on-onetimewithparents.Butthatdoesn'tmeanthattheyoungerchildrenhaveproblemswithlanguagedevelopment.Later-boorsdon'tenjoythatmuchtalkingtimewithparents,butinsteadtheyharvestlessonsfrombiggerbrothersandsisters,learningentirephrasesandgettinganunderstandingofsocialconceptssuchasthedifferencebetween"I"and"me”.
ACambridgeUniversitystudyof140childrenfoundthatsiblingscreatedarichworldofplaythathelpedthemgrowsocially.Love-haterelationshipswerecommonamongthechildren.Eventhosesiblingswhofoughtthemosthadjustasmuchpositivecommunicationastheothersiblingpairs.
Onewaychildrenseekmoreattentionfromparentsisbymakingthemselvesdifferentfromtheirsiblings,particularlyiftheyarecloseinage.Researchershavefoundthatthefirsttwochildreninafamilyaretypicallymoredifferentfromeachotherthanthesecondandthird.Girlswithbrothersshowtheirdifferencestoamaximumdegreebybeingmorefemininethangirlswithsisters.A2003researchpaperstudiedadolescentsfrom185familiesovertwoyears,findingthatthosewhochangedtomakethemselvesdifferentfromtheirsiblingsweresuccessfulinincreasingtheamountofwarmththeygainedfromtheirparents.
Theunderlinedpart"inadifferentfamily"(inPara.1)means“______________”。 A．inadifferentfamilyenvironment
B．inadifferentfamilytradition
C．indifferentfamilycrises
D．indifferentfamilies
参考答案：
答案解析：