12．The lunar calendar is said to have come into existence for several thousand years in China and is still in common use today．

分析 農(nóng)歷據(jù)說在中國存在了幾千年，今天還在使用．

解答 答案：existence 考查首字母填空．根據(jù)句意和句子結(jié)構(gòu)，要填入名詞，come into existence意為"存在"．

點評 考查首字母填空，準確地理解句子、翻譯句子，然后根據(jù)句意及提示寫出單詞，完成句子，使句意更通順．

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