题目内容
[音频]
A. During the Qin Dynasty.
B. During the Ming Dynasty.
C. During the Han Dynasty.
During Tan Dynasty.
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[音频]
A. To have a place for soldiers to live.
B. To be able to trade with people on the other side of the wall.
C. Because soldiers needed help during attacks.
D. Because it was very safe to live close to the wall.