第九章The Xuan paper is made in Xuanzhou of_____ Province.
答案:Anhui
Cai Lun invented movable type printing.The invention of technique of printing greatly sped up the international development of culture and exchanges. It is no doubt that the movable type printing is one of the greatest contributions to the world.Sinan comprised a smooth plate carved with directions; the handle of the spoon pointed ______, and the head ______.Since niter, the major raw material of the gunpowder, is as white as snow, Arabians called the gunpowder _____ and ______ .The first quantum communication satellite was named after Chinese ancient scientist _____ for his early achievements in physical optics.Jiaolong is the first operational deep-sea manned submersible designed independently in China. It is the most capable operational manned submersible in the world at present.In 2012, Jiaolong manned submersible made a 7000 meter sea trial. Before that, only the US, France and Russia had manned deep submarines in the world.Yuan Longpingis an expert on hybrid rice breeding in China and a pioneer in the research and development of hybrid rice in China.In the spring of 1961, Yuan planted the seeds of the mutant in a pioneering field, proving that the plant, discovered in 1960, was a "natural hybrid rice".
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