To support the central idea of the passage, the following two text features would be most helpful:
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A map of Alexander the Great's route and the site of the sugar cane discovery - This would provide geographical context to the narrative and illustrate the significance of the exploration and discovery of the "sweet reed."
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A timeline showing when Darius I and Alexander the Great learned of sugar cane - This could help situate the historical events in relation to each other and illustrate how knowledge of sugar cane spread over time.
These features would enhance the reader's understanding of the historical context and the exploration efforts described in the passage.