一个长方形的长是5米,宽是4米,它的周长是□米。□内应是[ ]
A. 5×4
B. 5+4
C.(5+4)×2
答案:C
The boy was doing homework while his mother dinner.
A.cooks
B.cooked
C.was cooking
D.will cook
徐州博物馆是一座现代化的地方综合性博物馆,开展业务有哪些?