2011年潮宗街口万达建筑工地发现的古城墙遗址，是哪个朝代至哪个朝代的城墙？
参考答案：宋代至明代
After being broadcast on TV, the news was known by all ________.
A. at any time B. in no time all the time D. at one time
在一个西瓜上面横竖各切三刀，吃后，剩下多少块西瓜皮？
A．12
B．13
C．16
D．20
all the time D. at one time