题目内容
The Grand Canal between Beijing and Hangzhou was firstly constructed in Spring and Autumn period in ancient China for the purpose of military action.
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In ancient China, people paired items from Heavenly Stems and Earthly Branches respectively to mark the year, and sixty years form a cycle.
In 1987, Deng Xiaoping proposed the policy of "Reform and Opening-up". In the next few years, China's economy has developed at an unprecedented rate.
商代青铜器是酒器的组合，周代是重食器的组合。春秋战国时期，则是一种什么样组合？
制作复杂青铜器的方法为？
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