GRE Reading Comprehension: OG/PP2-GRE阅读OG/PP2 - SSAMP4HYDKSFLF40P

According to the passage, as the process of arousal in an organism continues, all of the following may occur EXCEPT A. the production of adrenaline B. the production of norepinephrine C. a heightening of sensitivity to stimuli D. an increase in selectivity with respect to stimuli E. an expansion of the range of states mediated by the brain stem