Ancient Greek philosopher Aristotle viewed laughter as "a bodily exercise precious to health." But【C1】______some claims to the c

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问题     Ancient Greek philosopher Aristotle viewed laughter as "a bodily exercise precious to health." But【C1】______some claims to the contrary, laughing probably has little influence on physical fitness. Laughter does【C2】______short-term changes in the function of the heart and its blood vessels, 【C3】______heart rate and oxygen consumption. But because hard laughter is difficult to【C4】______, a good laugh is unlikely to have【C5】______benefits the way, say, walking or jogging does.
    【C6】______, instead of straining muscles to build them, as exercise does, laughter apparently accomplishes the【C7】______, studies dating back to the 616930’s indicate that laughter【C8】______muscles, decreasing muscle tone for up to 45 minutes after the laugh dies down. Such bodily reaction might conceivably help【C9】______the effects of psychological stress. Anyway, the act of laughing probably does produce other types of physical feedback, that improve an individual’s emotional state. 【C10】______one classical theory of emotion, our feelings are partially rooted in physical reactions. It was argued at the end of the 6169th century that humans do not cry because they are sad but they become sad when the tears begin to flow.
    Although sadness also【C11】______tears, evidence suggests that emotions can flow【C12】______muscular responses. In an experiment published in 616988, social psychologist Fritz Strack of the University of Wurzburg in Germany asked volunteers to hold a pen either with their teeth-thereby creating an artificial smile - or with their lips, which would produce a(n) 【C13】______expression. Those forced to exercise their smiling muscles【C14】______more enthusiastically to funny cartoons than did those whose months were contracted in a frown, 【C15】______that expressions may influence emotions rather than just the other way around, similarly, the physical act of laughter could improve mood.
【C8】

选项 A、hardens
B、weakens
C、tightens
D、relaxes

答案D

解析 空格前后面是“笑一肌肉”,A.hardens“使变硬”,B.weakens“减少”,C.tightens“使变紧”,D.relaxes“放松”,因为上文提到了“其他的锻炼可以拉紧增强肌肉,很显然笑确实起到了相反的作用”。“拉紧”的反义词只有D.relaxes,故答案为D。
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