来自梁俊卿的问题
Therearefortystudentsintheirclass.Tenofthemaregirlsand()areboysAthirdforthBthirdforhhsCthreefourthDthreefourth
Therearefortystudentsintheirclass.Tenofthemaregirlsand()areboys
AthirdforthBthirdforhhsCthreefourthDthreefourth

