My ruler is 20 ... 接什么英文单位?

My ruler is 20 ... 接什么英文单位? that is my ruler This is my yellow ruler This is my ruler.改错 This is my ruler.(划线部分提问)my ruler画线 This is my ruler中的my ruler怎么提问? This is not () ruler .my ruler is red . This is my ruler.His ruler is not an old.--------- --------- 改错 ChenJie ruler is longer than my ruler. this is( )ruler.写什么 ______?That's my ruler.A.Whose ruler is it?B.What ruler is i this is my ruler改成否定句