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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" .

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：正确

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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 &quot; natural hybrid rice&quot; .

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" .