"Emperor Zhengzong, being deeply concerned with agriculture, came to know that the Champa rice was drought resistant and that the green lentils of India were famous for their heavy yield and large seeds. Special envoys, bringing precious things, were dispatched with a view to securing these varieties.... When the first harvests were reaped in the autumn, the emperor called his closest ministers to taste them and compose poems for Champa rice and Indian green lentils."Shu Wenying, Buddhist monk, China, eleventh century C.E. The activities of the state described in the passage are consistent with which of the following Song dynasty policies?

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