2. 外语
  3. After years of strenuous work, the scientists are on the __________.of a great discovery of human gene.

After years of strenuous work, the scientists are on the __________.of a great discovery of human gene.

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问题 After years of strenuous work, the scientists are on the __________.of a great discovery of human gene.
选项 A、domain
B、premise
C、threshold
D、pretext
答案C
解析 经过多年的辛勤工作，科学家们即将在人类基因方面取得重大突破。本题是考查名词的用法。domain“(活动，思想的)领域，范围”；premise“前提，假设”；threshold“开端，即将开始”，on the threshold of是一个固定词组，意为“即将，将要”；pretext“借口，托词”。
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