语法与词汇 10.By______scientific rigor with a quantitative approach, researchers in the social sciences may often have______their scope to whose narrowly circumscribed topics that are well suited to quantitative methods.
【正确答案】 D
【答案解析】句意：通过科学而严格的计量方法的鉴定，社会科学家的研究范围被限定在可以运用计量方法的范闱之内。identify鉴定。undermine破坏。diminish减少。equate等同。vitiate损坏。