A:烧杯中有铜无铁
B:烧杯中有铁无铜
C:烧杯中铁、铜都有
D:烧杯中铁、铜都无
— Johnson? Oh, yes, Mr. Johnson. It's Room 1201, on the second floor.
下列关于进入青春期的说法错误的是( )