Can you skate on the ice? [ ]
A. No, I can.
B. Yes, I can.
C. I can't ski.
答案:B
世界各国的政治制度不一样,主要有______和______两种.中国是______国家.
钢筋混凝土圈梁的最小梁高是()
A.60mm
B.120mm
C.180mm
D.240mm