GRE Text Completion: JiJing 1373-GRE填空机经1373题 - WTG3Q15C7V23VSD7A

Scientists suspect that athletes may experience augmented bloodstream levels of the hormone oxytocin during competition. (i)____________ considerations, however, make it difficult to (ii)____________ oxytocin levels during sports events: few will willingly interrupt play in the middle of a game in order for scientists to test players' blood. A. Practical B. predict fluctuations of C. Theoretical D. quantify changes in E. Ethical F. trigger elevation of