北京市境内现在长城主要是（）长城，总长度629公里，城台827座，关口城堡71座。
A.秦
B.汉
C.唐
D.明
参考答案：D
. When I did well in the exams, my father usually looked at me and reminded me to keep modest.
A．happy
B．happily
C．more happy
D．happiness
如果-800元表示支出800元，那么+200元表示______．
