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GRE填空题及答案(汇总)

　　3. 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

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