一、核心词汇(会听,说,读,写的单词) first (1st) 第一 second (2nd) 第二 third (3rd) 第三 fourth (4th) 第四 fifth (5th)第五 sixth (6th) 第六 seventh (7th)第七 eighth (8th)第八 ninth (9th)第九 tenth (10th) 第十 eleventh (11th) 第十一 twelfth (12th)第十二 thirteenth (13th) 第十三 fourteenth (14th) 第十四