模仿文本：

But first, Iraqi Christians in the northern city of Mosul have been forced to flee after an ultimatum by the Islamist militant group ISIS. The ultimatum was passed on a week ago, and it gave Christians three options: to convert to Islam, pay a protection tax, or be killed. 

译文：

伊斯兰武装组织ISIS对北部城市摩苏尔的伊拉克基督徒们下达最后通牒后，基督徒们被迫逃离那里。这份最后通牒于一周前通过，它给基督徒们提供三种选择：改信伊斯兰教；上缴保护税；或者等死。