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In ____, the earliest extant was printed. A. 868A.D.B. 1150A.D.C. 612A.D.D. 121A.D.

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When the history developed to Spring and Autumn Period ,text engraved on tortoise shell and animal bone, called oracle, firstly appeared in China. ______

A. 对
B. 错

China firstly used gunpowder for military purposes. ______

A. 对
B. 错

As for September 2018, Tianyan has found 62 high-quality pulsar in the universe. ______

A. 对
B. 错

Till the end of 2015 China’s high-speed railway has reached more than 18,000kilometers, ranking first in the world. ______

A. 对
B. 错

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