Despite the abundance and importance of maize, its biological ori

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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、utility	D、helpful
B、popularity	E、important
C、ancestry	F、obvious

答案：C,F

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