题目内容
When the history developed to Spring and Autumn Period ,text engraved on tortoise shell and animal bone, called oracle, firstly appeared in China. ______
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China firstly used gunpowder for military purposes. ______
As for September 2018, Tianyan has found 62 high-quality pulsar in the universe. ______
Till the end of 2015 China’s high-speed railway has reached more than 18,000kilometers, ranking first in the world. ______
Online shopping reduces the selling price of goods because the costs of merchandise are low. ______
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