题目内容
Human space activities mainly include three major areas: ____, manned spaceflight and ____.
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In ____, the earliest extant was printed. A. 868A.D.B. 1150A.D.C. 612A.D.D. 121A.D.
When the history developed to Spring and Autumn Period ,text engraved on tortoise shell and animal bone, called oracle, firstly appeared in China. ______
China firstly used gunpowder for military purposes. ______
As for September 2018, Tianyan has found 62 high-quality pulsar in the universe. ______
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