Researchers at the University of Colorado are investigating a series of indicators that could help themselves to predict earthquakes.
【正确答案】
1、正确答案:themselves--them
【答案解析】解析:考查反身代词。只有当主语和宾语为同一人物或事物时,宾语才可用反身代词。此句为复合句,定语从句的先行词为indicators,而此处指的是主句的主语Researchers,所指不一致,不能用themselves,故应改为them。