________——曾是保存旧中国的首要条件。（马克思语）[ ]
A．文化专制
B．重农抑商
C．与外界隔绝
D．对外交往
答案：C
-No one knows what was Stonehenge used for.
-Someone thought it was used for_ ___ a great victory over an enemy. [ ]
A. celebrating
B. celebrate
C. celebrated
为什么架线式电机车行驶轨道在进行电气连接？
