Ancient Greek philosopher Aristotle viewed laughter as“a bodily exercise precious to health.”But---_____some claims to the contrary,laughing probably has little influence on physical filness Laughter does_____short-term changes in the function of the heart and its blood vessels,____heart rate and oxygen consumption But because hard laughter is difficult to____,a good laugh is unlikely to have_____benefits the way,say,walking or jogging does.____,instead of straining muscles to build them,as exercise does,laughter apparently accomplishes the____,studies dating back to the 1930’s indicate that laughter.muscles,Such bodily reaction might conceivably help____the effects of psychological stress.Anyway,the act of laughing probably does produce other types of______feedback,that improve an individual’s emotional state.______one classical theory of emotion,our feelings are partially rooted_______physical reactions.It was argued at the end of the 19th century that humans do not cry______they are sad but they become sad when te tears begin to flow.Although sadness also_______tears,evidence suggests that emotions can flow_____muscular responses.In an experiment published in 1988,social psychologist Fritz Strack of the University of würzburg in Germany asked volunteers to____a pen either with their teeth-thereby creating an artificial smile–or with their lips，which would produce a（n）_____expression.Those forced to exercise their enthusiastically to funny catoons than did those whose months were contracted in a frown，_______that expressions may influence emotions rather than just the other way around____，the physical act of laughter could improve mood.
根据句意可以判断空格前是实验的结果，即：那些被强制锻炼笑肌的人比那些嘴唇皱着表情失望的人在观看有趣的动画片时反应更加丰富。空格后是实验推出的结论“表情会影响情绪，而不是情绪影响表情”。所选动词要能体现二者的关系，四个选项中[B]requiring“需要，要求”，?[C]mentioning“提到”，[D]supposing“假定,?假设”都不符合上下文语境，故排除。[A]suggesting表明，后接结论的句子，符合要求，故为正确答案。
