As is known to all，________is famous for its________．A.China，chinaB.china，ChinaC.China，ChinaD.china，china
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A解析分析：China(中国)是专有名词；china(瓷器)是普通名词；根据句意“众所周知，中国以瓷器而闻名。”应该选A．(延伸)Marathon是希腊的地名，是专有名词；marathon是“马拉松长跑”，是普通名词，如：The marathon，a 26-mile running race，took place and now it takes place in many cities all over the world every year．