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7．A quarter of an hour isfifteen （十五） minutes．

分析一刻鐘是15分鐘．

解答答案：fifteen 根據所給漢語提示"十五"，可知此處需要數詞：基數詞fifteen或序數詞fifteenth．根據其后的minutes，可知這是名詞的復數形式．基數詞+名詞復數形式（基數詞大于一）；序數詞+名詞單數．故答案為fifteen．

點評本題考查數詞．要根據其后的名詞是單數還是復數，來判斷用基數詞還是序數詞．

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