在服务业最重要的是人脉的积累。
参考答案:对
历史上,曾以北京作为京城的朝代是( )
A.隋、唐、元、明
B.金、元、明、清
C.宋、元、明、清
D.周、汉、元、清
What a pity! I missed meeting my friend at the airport because my car was ________ in the traffic jam. [ ]
A. broken up
B. held up
C. kept back
D. kept up