21世纪 是twenty first century 还是 twenty one century 还是别的什么的?我看到名为21st century 的报纸,中的21st是不是应该按序数词的读法读成twenty first century?

21世纪 是twenty first century 还是 twenty one century 还是别的什么的?我看到名为21st century 的报纸,中的21st是不是应该按序数词的读法读成twenty first century? twenty-first怎么发音?是念：twenty the first ；还是念：twenty first就可以? twenty-first怎么读?21 英语口语中,“我21岁”是I am twenty first years old,还是twenty one years old? By the twenty-first century,the computer ____a necessarity in every homeAhas become B.will have become为什么不选b,21世纪不是已经到了吗 _____of March is my sister’s birthday 选项:a、The twenty-one b、Twenty- one c、The twenty-first d_____of March is my sister’s birthday选项:a、The twenty-oneb、Twenty- onec、The twenty-firstd、Twenty –first We live in ( ) A the twenty--first centry B the century twenty-one C century twenty -oneD the century twenty-first 英语21日怎么说,第21怎么说?第21是twenty-first吗? My brother has ______ storybooks A.twenty B.twentieth C.the twelve D.twenty-first twenty-first简写 twenty-first的简写可不可以是12th? I think that the-- century will bring us more hopes.twenty-onetwentieth-firsttwenty-firsttwentiethA.twenty-one B.twentieth-first C.twenty-first D.twenyieth-one 21英文为什么有的人用twenty-first ,有的人用twenty-one ,有什么不同? 英语的序数词怎么写?twenty-first,twenty first,21th,21st哪个对哪个更常用? 英语多少世纪 例如 21世纪 是 21st century.其中“st”代表的是first的“st”吗?那,19世纪又怎么写?求原理 We all think that the ____century will bring us more hopes A.twenty- first B.thousand of C.twentyA.twenty- first B.twentieth-first C.twenty-one D.twentieth-one I have about ( ) friends in my school.A twenty B twenty one C twenty-first D nineteen选什么 请说出原因 谁有twenty-first century