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提问学生对于7大类数词的用法，教师对于学生回答过程中疑难，给予解释。
知识点包括：基数词用法、年月日表示法、时间表示法、分数表示法、序数词用法、百千万用法、其它用法
难点解释：1、分数表示法：分数加短线时，不影响加s。
2、数量形名等结构：有名加短线，无名加s。
Step3. 检查自测情况
检查学生自学后的自我检测情况。
( ) 1. Lincoln was born on ________.
? A. February 12, 1809? B. 1809, February 12?? C. 1809, 12 February?? D. February 1809,12
(? ) 2. A _______ boy can sing the English song very well.
A. ten-year-old B. ten years old C. ten-year-old D. fifth years old
( ) 3. An hour later, _____ minister was sent to see the “magic cloth” woven by those two men.
A. two B. the second C. the two D. second
( ) 4. Abraham Lincoln was _______ President of the United States.
A. 16 B. the 16 C. 16th D. the 16th
( ) 5. Do you think there is any room for us ________ ?
A. two B. the two C. second D. the second
( ) 6. How many students are there in your class?
________.
A. Twenty nine B. Thirty and two C. Forty-five D. fifties
( ) 7. Which number is wrong? _______.
A. Ninety B. Ninteen C. Ninth D. Nineteenth
( ) 8. The People's Liberation Army was founded _______.
A. on August 1, 1927 B. in 1927, 1 August C. on August 1st, 1927 D. in August 1, 1927
( ) 9. The number 4,123 is read _______.
A. four thousand one hundred and twenty-three B. four thousand and one hundred twenty-three
C. four thousand and a hundred and twenty-three D. four thousands a hundred and twenty-three
( ) 10. The old professor still works hard though he is _________.
A. in his sixty B. in his sixties C. in sixties D. in the sixty
( ) 11. This classroom is ________ ours.
A. three times big as B. as three times big as C. three times as big as D. as big three times as