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【答案与解析】本文是一篇说明文。研究发现,学习一门新语言可以提高人们的认知能力8.B细节理解题。根据第二段“ We recruited2 o volunteers who had never Ined to learn Spanish before.,”可知,这一十名志愿者在参与研究之前不会说西班牙语29.D细节理解题,根据第三段“ Volunteers had also been carefully selected sccording to their age so that wecould compare the effect of language learning on older and younger people.”可知,研究人员按年龄选择志愿者是为了了解语言学习对老年人和年轻人的影响30.A细节理解题,根据第五段“ In the four weeks when we run our study, none of our volunteers becamefluent, but they did practise regularly, and this was enough to give them the cognitive benefits. "nf al. f>表明,定期的语言练习是促使认知能力提高的关键31.A主旨大意题,通读全文,尤其是文章第一段“ However, our research suggests learning a new language isbenefieial to our brain”及最后一段可知,文章主要通过研究说明学习新语言有助于提高认知能力,更多内容，请微信搜索关注。