Whencouplesgetmarried，theyusuallyplantohavechildren．Sometimes，however，acouplecannothaveachildoftheirown．Inthiscase，theymaydecidetoadoptachild．Infact，adoptionisverycommontoday．Thereareabout60thousandadoptionseachyearintheUnitedStatesalone．Somepeopleprefertoadoptinfants，othersadoptolderchildren，somecouplesadoptchildrenfromtheirowncountries，andothersadoptchildrenfromforeigncountries．Inanycase，theyalladoptchildrenforthesamereason---theycareaboutchildrenandwanttogivetheiradoptedchildahappylife．

Mostadoptedchildrenknowthattheyareadopted．Psychologistsandchild-careexpertsgenerallythinkthisisagoodidea．However，manyadoptedchildren，oradoptees，haveverylittleinformationabouttheirbiologicalparents．Asamatteroffact，itisoftenverydifficultforadopteestofindoutabouttheirbirthparentsbecausethebirthrecordsofmostadopteesareusuallysealed．Theinformationissecretsonoonecanseeit．Naturally，adoptedchildrenhavedifferentfeelingsabouttheirbirthparents．Manyadopteeswanttosearchforthem，butothersdonot．Thedecisiontosearchforbirthparentsisadifficultonetomake．Mostadopteeshavemixedfeelingsaboutfindingtheirbiologicalparents．Eventhoughadopteesdonotknowabouttheirnaturalparents，theydoknowthattheiradoptedparentswantthem，lovethemandwillcareforthem．

71．Accordingtothepassage，somecouplesadoptchildrenbecause___

A．Theycarealotaboutchildren．

B．Theyneedlookingafterintheiroldage．

C．Theywanttoenrichtheirlifeexperience．

D．Theywantchildrentokeepthemcompany．

72．Whyisitdifficultforadopteestofindoutabouttheirbirthparents？___

A．Theyareusuallyadoptedfromdistantplaces．

B．Theirbirthparentsoftentrytoconceal（隐藏）theirbirthinformation．

C．Theirbirthinformationisusuallykeptsecret．

D．Theiradoptiveparentsdon'twantthemtoknowtheirbirthparents．

73．Adopteesfindithardtomakethedecisiontosearchfortheirbirthparents，because___

A．Theygenerallyholdbadfeelingstowardstheirbirthparents．

B．Theydonotwanttohurtthefeelingsofthe