单项选择。
—Where you from? —I from China.[ ]
A. are; is
B. is; are
C. am; is
D. are; am
答案:D
1/3,1/7,1/13,1/21/( )
A.1/28
B.1/29
C.1/30
D.1/31
我国的一级邮区中心局包括:北京、沈阳、重庆、上海、武汉、广州、西安共七个。