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D【文章大意】本文是一篇说明文。文章主要介绍了微笑有助于人们保持积极情绪的原因。32B推理判断题。【解题思路】根据第一段内容尤其是第一句中的 "famous people have long sung about the power of a smile-how it picks you up, changes your outlook, and generally makes you feel better可知,第一段介绍了微笑的好处,这是为了引出文章的主题,即说明微笑有助于人们保持积极情绪的原因。故选B33D推理判断题。【解题思路】根据第三段第二句In both studies, smile was caused by participants holding pen between their teeth, foreing their facial muscles to reproduce the movement of smile.可推知,研究人员是通过记录参与者在微笑时面部肌肉的活动轨迹来研究微笑的。故选D34D细节理解题【解题思路】根据最后一段最后一句“In our research we found that when you forcefully practise smiling, it stimulates(刺激) the amygdala-the emotional centre of the brain which releases neurotransmitters(神经传递素)to encourage an emotionally positive state.可知,在研究过程中,研究人员发现当你强迫(自己)练习微笑时,大脑的情绪中枢会分泌出一种叫做神经传递素的化学物质,这种物质能使人保持一种积极的状态。故选D35标题概括题。【解题思路】通读全文可知,文章主要介绍了微笑有助于人们保持积极情绪的原因。C项适合做本文的最佳标题。故选C。【长难句分析】 Groundbreaking research from the University of South Australia confirms that the act of smiling can trick your mind into being more positive, simply by moving your facial muscles.(第二段)分析:本句是一个复合句。that引导宾语从句。译文:来自南澳大利亚大学的突破性研究证实,只需简单动一动你的面部肌肉,微笑的动作就可以诱使你的大脑变得更加积极。词汇积累:claim.声明,宣称 positive adj.积极的 participant.参与者