GRE Text Completion: JiJing 1373-GRE填空机经1373题 - A7RK7JBO0KTF57O4A

In the search for truth, the knowledge gained by scientists consists of approximations with varying degrees of certainty. Such (i)____________ truth can be highly (ii)____________, as the rapid and relatively steady progress of medical knowledge well exemplifies. A. unambiguous B. useful C. esoteric D. equivocal E. provisional F. contentious