One of the strangest findings to emerge from the world of obesity science lately is
that people who sleep less tend to weigh more. But until recently, we have been
stifling our yawns and _____16_____ our heads about why: Does lack of sleep alter our
biology? Or does it affect our eating behavior? Now two reports _____17_____ the answer is
both.
Both studies used functional MRI to _____18_____ brain activation as their subjects viewed
food pictures—analogous to the subjects’ _____19_____ bombarded with a stream of
McMuffin ads after a long night of working (or partying). Each study _____20_____ that sleep
loss caused areas within a key motivation network, including the striatum and
anterior cingulate cortex, to go into overdrive at the mere sight of food. The same
circuit perks up when addicts view images of their substance of choice.
(adapted from http://www.scientificamerican.com/article.cfm?id=tired-watch-what-you-eat) 【題組】19. (A) be (B) being (C) have (D) having