A:华北平原
B:黄土高原
C:喜马拉雅山
D:珠江三角洲
西红柿因其美味可口,营养丰富,越来越受到人们的青睐.用开水烫一下西红柿,会在其表面撕下一层皮,这层皮属于( )
(2015•临沂)计算:(3+2﹣1)(3﹣2+1)
— Were you at home _________?
— No, I was at school.