Northern Ireland is small，but it is significant because of the _

Northern Ireland is small，but it is significant because of the __.
A、the economic problems
B、the political troubles
C、the immigration issues
D、the national identity
【正确答案】：B
【题目解析】：本题考查北爱尔兰。北爱尔兰面积虽小，但由于政治上的麻烦，它的重要性可见一斑。