GRE Text Completion: JiJing 1373-GRE填空机经1373题 - VSO7F3708J7JDSHWA

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)____________. A. utility B. helpful C. popularity D. important E. ancestry F. obvious