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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.
- Blank(i)
- practical
- theoretical
- ethical
- Blank(ii)
- predict fluctuations
- quantify changes in
- trigger elevation of
practical , quantify changes in 显示答案
以上解析由 考满分老师提供。
