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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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".

A.正确

B.错误

正确答案：A

Tag：向世界讲述中国时间：2021-05-19 15:10:16

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