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1、专题复习(四)-数词基数词：1.百与十之间用and,十位与个位用“”eg:thirtyone 2.in the +年代s 在几十世纪几十年代 eg: in the 1990s=in the 1990s3.in ones +复数 在某人.岁时 eg: in his forties在他四十多岁时4.another two apples=two more apples 另外两个苹果分数：分子基数词，分母序数词，分子大于1，分母加s eg：a half 1/2 a quarter 1/4 three quarters 3/4 one third 1/3 two thirds 2/3 two fifth
2、s 2/5 百分数：数词+percent eg:40percent 40%百分数、分数+of+名词，谓语动词单复数取决于名词 eg:Two thirds of the work has been finished.其它用法：1.hundred.thousand.million.billion前有具体数字，不加s，不与of连用；无具体数字，既加s，又加of.2.half an hour半小时 3.one and a half hours=one hour and a half 一个半小时4.Page Ten=the 10th page Lesson One=the first lesson No
3、.10 bus Room1015.on ones+序数词+birthday 在某人.岁生日时6.时间表达：6:30 six thirty=half past six (at) 6:15 six fifteen=a quarter past six 6:45 six forty-five=a quarter to seven练习( ) 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
4、the English song very well. A. ten-years-old B. ten years old C. ten-year-old D. fifth years old( ) 3Nowadays_of business letters are written in English .A two third B two thirds C two three D second three ( ) 4. Abraham Lincoln was _ President of the United States. A. 16 B. the 16 C. 16th D. the 16
5、th( ) 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. The old professor still works hard though he is _. A. in his sixty B. in his sixties C. in
6、sixties D. in the sixty( ) 8. 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( ) 9. There was no bus in that small town. We had a _. A. ten miles walk B. ten-mile walk C. ten miles walk D. tenth mile walk( ) 10. On May _, _ people traveled around the country. A. the first, millions B. the first, millions of C. first, the millionth D. first, millions of “北斗”卫星导航系统是我国自行研制的全球卫星定位与通信系统，将来可在全球范围内全天候、全天时为各类用户提供高精度、高可靠定位、导航、授时服务，并具有短报文通信能力。“北斗”卫星导航系统在抗震救灾中发挥的主要作用有2
