Zhang Qian was ordered to visit ( )? A: Yue B: Da Yuezhi C: Xixia D: Xiongnu

The Northern Song fought many wars with Liao in order to regain the sixteen cities of Youyun .( ) A: Xiongnu B: Jin C: Xixia D: Liao

Emperor Wu of the Han Dynasty, by means of this powerful material and00a0___________00a0resources, promptly attacked the Xiongnu invasion, and fundamentally relieved the northern threat. That was the circumstance when Zhang Qian set out to the west.