题目

 探究吲哚乙酸对月季插条生根的作用，结果如图．有关实验的分析和评价，正确的是 A. 不同浓度的吲哚乙酸处理扦插枝条的时间应不同 B. 本实验可以不设用蒸馏水处理扦插枝条的对照组 C. 使扦插枝条产生相同根数的吲哚乙酸浓度一定相同 D. 吲哚乙酸超过一定浓度范围能抑制扦插枝条生根 答案：DEuropeans made ______ clear that they did not want to take the Roma as neighbors. [     ]A. soB. very C. it D. that