Despite the abundance and importance of maize, its biological origin has been a long-running mystery. The bright yellow, mouth-w

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问题 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

选项

答案C,F

解析 第一句和第二句并列,同义对应。第一句说玉米的起源是一个长期以来的谜。第二句说玉米的(i)________根本就不(ii)________。因此,空格(i)和空格(ii)只要填入合适的词使得整句话表示“玉米的起源是一个长期以来的谜”即可。扫视选项,发现填入C项ancestry(祖先,起源)F obvious(明显),第二句话就成了“玉米的起源根本不明显”,也就表达了“玉米的起源是个谜”的意思。
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