15.参考答案说明分析因为 ana=tar(+1-1m1m,2工=>0所以0受2×又因为tan2a=2tang30,所以0<2a<2,所以tn(2-P)=1+tan2 atan Btan Zatan B因为少∠0,所以

短文改错As an exchange student, I must admit that atfirst America was a big culture shock for me. I staystavewith a host family in a small town. My host parents organized a lot of activities in my spare time such that Iwouldnt miss home but feel lonely. However, life was hardly to get used A. My main problem was over theornartothwItlanguage. I failed to understand many in the first few weeks because everyone spoke so fast and used a lot ofmuchidioms. Food was another difference. Their host family always had bread, potatoes and salad for mealIs. I reallyMymiss dumplings, rice and delicious dishdishes

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