题目内容
1.写出下列序数词的缩写形式。
(1) first second third
fourth fifth sixth seventh
eighth ninth tenth
(2) twelfth fifteenth
eighteenth twentieth
(3) twenty-first twenty-second
twenty-third
1. (1) 1st, 2nd, 3rd, 4th, 5th, 6th, 7th, 8th, 9th, 10th
(2) 12th, 15th, 18th, 20th
(3) 21st, 22nd, 23rd
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