Could a hug a day keep the doctor away?The answer may be a resounding"yes!"___1__helping you feel close and__2___to people you care about,it turns out that hugs can bring a___3__of health benefits to your body and minD.Believe it or not,a warm embrace might even help you__4___getting sick this winter.In a recent study___5__over 400 healthy adults,researchers from Carnegie Mellon University in Pennsylvania examined the effects of perceived social support and the receipt of hugs___6__the participants'susceptibility（敏感性）to developing the common cold after being___7__to the virus.People who perceived greater social support were less likely to come___8__with a cold,and the researchers__9___that the stress-reducing effects of hugging___10__about 32 percent of that beneficial effect.___11__among those who got a cold,the ones who felt greater social support and received more frequent hugs had less severe__12___."Hugging protects people who are under stress from the___13__risk for colds that's usually__14___with stress,"notes Sheldon Cohen,a professor of psychology at Carnegie.Hugging"is a marker of intimacy and helps__15___the feeling that others are there to help___16__difficulty."Some experts___17__the stress-reducing,health-related benefits of hugging to the release of oxytocin（后叶催产素）,often called"the bonding hormone"__18___it promotes attachment in relationships,including that between mothers 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.9选？
此处考察上下文的词义辨析能力。上文提到这种效应的正向作用，文中指出and the researchers____that the stress-reducing effects of hugging____32 percent of that beneficial effect.空格所在句子前有一个and，这是顺接的并列递进关系，空格后面出现数字,所以此句子还是延续上文的基调，更进一步的用具体数字体现这种正向作用。因此排除负向词汇B.denied否认C.doubt怀疑，A.imagined.想象，实验是不能选择想象的。只能是测量计算得出，因此正确答案为D选项。
