GRE Text Completion: JiJing 1373-GRE填空机经1373题 - HUJ700904D0W0H1XA

The description of humans as having an internal clock is not a (i)____________. Or rather, it is – you do not have a tiny watch in your cerebellum – but it also refers to (ii)____________, a specialized bundle of cells that regulates cyclical processes. A. euphemism B. an elusive psychological phenomenon C. cliché D. a standard literary trope E. metaphor F. a real biological feature