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【答案】C【解析】因为2 bcos B=acos C十ccos A,由正弦定理可得2 sin Bcos B=sin Acos C十sin Ccos A=sin(A+C)=5inB,又0
【语篇导读】本文是[文]一篇说明文。文章对[章]北极美妙的野生生物[来]、风景和当地文化进[自]行了介绍。l2.D[知]词义猜测题。根据第[嘛]二段的Travel[答]ling to the Arctic leaves an unforgett[案]able impressio[网]n on the visitors.[文]可知，此处指北极的[章]广阔和它脆弱的环境[来]是最令人印象深刻的[自]。所以blow away意为“令…[知]印象深刻”。13.[嘛]B￥细节理解题。根[答]据第四段的One of the most impressiv[案]e attractio[网]ns and maybe the most difficult[文] to see isthe Northern Lights,on[章]e of the seven natural wonders of the world..可知[来]，北极光是自然光，[自]很难看到。l4.C[知]推理判断题。根据最[嘛]后一段的It is recommend[答]ed that visitors go with tour groups that are respectfu[案]l ofArctic residents[网] and their culture Finding tour groups that work with local communiti[文]es is important[章].,游客应选择合适[来]的旅行团。l5.C[自]写作意图题。根据第[知]一段的The icy beauty of the Arctic attracts thousands[嘛] of visitors every year to see itswonder[答]ful wildlife,[案]landscape[网] and local cultures.[文]及全文内容可知，作[章]者写这篇文章的目的[来]是介绍一个受欢迎的[自]旅游目的地。
