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Though scientists get closer to understa...

Though scientists get closer to understanding why we age the reason for different aging rates among individuals remains only __________ understood

A.concretely B.thoroughly

C.vaguely D.flexible

 

C 【解析】 考查副词词义辨析。A. concretely具体地;B. thoroughly彻底地;C. vaguely含糊地、茫然地;D. flexible灵活的。句意:尽管科学家对人类衰老的原因有了更深的了解,但对于个体衰老速度不同的原因,人们仍知之甚少。根据句意可知此处表示“模糊地”,故C项正确。  
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