Americanschoolsdonothaveseparateclassesforboysandgirls.Ifboyswanttocookortosew,theycanlearnthesethingsinclassesthatarenolongerjustforgirls.Ifgirlswanttorepaircars,theycannowlearnthisinschool.Moststudentslike

　　Americanschoolsdonothaveseparateclassesforboysandgirls.Ifboyswanttocookortosew,theycanlearnthesethingsinclassesthatarenolongerjustforgirls.Ifgirlswanttorepaircars,theycannowlearnthisinschool.Moststudentsliketohaveboysandgirlsonthesamebaseballteam.

　　Manyboysandgirlsdressalikeinschool.Theywearbluejeansandsportshirts.Somehavelonghairandsomehaveshorthair.Sometimesaboyhaslongerhairthanagirl.

　　Eventhelanguageisdifferent.Studentslearntosayfirefighterinsteadoffireman,police

　　officerinsteadofpoliceman,andlettercarrierinsteadofmailman.Apersondoesnotneedtobeamantofightafireortodeliverthemail

　　Mostpeoplethinkthatthesechangesaregood.Theygiveallpeopleanequalchancetobehappyandtodowhattheywanttodowiththeirlives.Fathersliketotelltheirsonsthattheycangrowuptobepresident.Today,motherscantellthesamethingstotheirdaughters

　　WemayinferfromthetextthatinthepastinAmericanschools_______.

　　A.thereweremanydifferencesbetweenboysandgirls

　　B.boycoulddoeverythingbutgirlscouldn’t

　　C.boysandgirlswerethesameineverything

　　D.girlsonlylearnedhowtosewandcook

　　这道题选什么为什么,具体原因