One of the four unusual demographic features of Ireland is _____

One of the four unusual demographic features of Ireland is ___________.
A、an early marriage age
B、an excess of males in the population
C、a low proportion of bachelors and spinsters of all ages
D、a high birthrate compounded by a century of emigration
【正确答案】：B
【题目解析】：本题考查爱尔兰的人口特征。根据课本P339可知，爱尔兰四个不同寻常的人口特征之一是男性人口过多。