A:i
B:wa
C:had bee
D:has bee
下列二次根式的运算:① 2×3=23 ;② 18−8=2 ;③ 25=255 ;④ (−2)2=−2 ;其中运算正确的有( )
如图,是某乳品厂生产的奶粉包装袋上的部分文字说明,根据说明判断下列说法中正确的是( )
A. white B. orange C. pencil D. pen E. green
Hi, I'm Lucy. I have a pencil box. It's ____ I have a ____ It's black. I have an eraser. It's ____ I have a ____ It's red. I have a crayon. It's____