Test analysis: The stem of the test reflects that Qin was punished for using Chu coins during the Warring States Period. The background of this phenomenon is that the currency has not been unified at that time, and all countries have issued currency, so it shows that ant nose money is not the currency issued at that time, and item C is correct; Item AB cannot be reflected or explained from the stem of the question; The stem of the question reflects that the flower coins of Chu State were punished in Qin State, and item D was wrong.