GRE Reading Comprehension: Maggoosh-GRE阅读Maggoosh - G672Q125TC80ZY97M

According to the passage, sniffing, as it relates to the experiment described in the passage, primarily A. poses both advantages and disadvantages to researchers B. offers researchers a quantifiable physiological response that exhibits little variation between sleeping and waking states C. provides researchers with a means of observing certain behaviors D. enables scientists to study the effect of sleep on memory consolidation E. functions as a non-verbal measure of changes that occur in lower areas of the brain