为什么说English plays a role as a second or a first而不是the second

为什么说English plays a role as a second or a first而不是the second Today,more people speak English as ther first,second or a fo Today,more people speak English as their first,second or a f speak English as their first,second or a foreign language th A first /a second/the first /the second learn English as ( a ) second language. in a second or learn English as ( a ) second language.这里为什么不填the啊`语言前面不是不加冠 Some people now also speak english as a foreign or second la A first-or upper -second class undergraduate honors English ( ) as a second english 中间填什么 most people speak English as a second language介词为什么用as?