题目内容
15．Thefifth （第五次） BRICS Summit was held in March，2013．分析 第五次金砖国家首脑峰会于2013年3月召开．
解答 答案：fifth．
根据句意"第五次金砖国家首脑峰会"可知这是对序数词的考查，故答案为fifth．
点评 知识扩充：
传统"金砖四国"（BRIC）引用了巴西、俄罗斯、印度和中国的英文首字母．由于该词与英语单词的砖（Brick）类似，因此被称为"金砖四国"．南非加入后，其英文单词将变为"BRICS"，并改称为"金砖国家"．
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