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Despite the abundance and importance of maize, its biological origin has been a long-running mystery. The bright yellow, mouth-watering treat does not grow in the wild anywhere on the planet, so its (i)_____ is not at all (ii)_____.
Blank(i)Blank(ii)
A、utilityD、helpful
B、popularityE、important
C、ancestryF、obvious
答案：C,F

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