Some experts 17 the stress-reducing , health-related benefits of hugging to the release of oxytocin, often called "the bonding hormone"18 it promotes attachment in relationships, including that between mother and their newborn babies. Oxytocin is made primarily in the central lower part of the brain , and some of it is released into the bloodstream. But some of it 19 in the brain, where it 20 mood, behavior. and physiology.
17、A.attribute B.commit C. transfer D.return
18、A.because B.unless C.though D.until
19、A.emerges B.vanishes C.remains D.decreases
20、A.experiences B.combines C.justifies D.influences
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