You ______a teacher. I ______ a student. My sister ______a student, too.
A:am; is; are
B:is; are; am
C:are; am; is
D:are; is; is
物质名称
氩气
____
氢氧化铜
氯化钾
化学式
CaSO4
Fe3O4
如图,下列说法错误的是( )