梦里江河的话： 感谢朋友提供的信息！人大附中27人，北师大实验中学11人，北京四中6人，十一学校5人，北师大二附中、清华附中、北大附中各1人。北师大实验中学
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--学而思高中数学联赛集训队张瑞祥同学为国争光2008年7月结束的第49届国际奥林匹克数学竞赛（IMO）中，学而思学员张瑞祥以优异的成绩夺得了个人金牌并率领中国代
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一、选择题（本题满分36分，每小题6分）1．设全集是实数，若A={x|0}，B={x|=},则是()(A){2}(B){-1}(C){x|x2}(D)2．设sina＞0,cosa＜0,且sin＞cos,则的取值范围是
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