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The soya bean originated in China, and the ancient Chinese called it 'the yellow jewel' but used it as 'green manure' to enrich the soil for growing other crops.
This answer choice is grammatically incorrect. The correct idiom is use X as Y. Also, replacing the preposition for with to creates a bad fit into the original sentence.
This answer choice is grammatically incorrect. The correct idiom is use X as Y.
This answer choice is indeed grammatically correct, but changes the meaning of the original sentence by replacing the conjunction "but" with the conjunction "and". Since there's nothing wrong with the original sentence, there's no reason for this change, and thus E is less preferable than answer choice A.