When did the Anglo-Saxons invade Ireland?（）……

单项选择题In Ireland today about（）of the population are Roman Catholics.

A.75%
B.80%
C.90%
D.93%

单项选择题The population of Ireland is predominantly of（）origin.

A.English
B.Celtic
C.Norman
D.French

单项选择题The population decreased from the 1840s until about 1970,largely because of（）.

A.a low birth rate　
B.a high death rate
C.a low employment rate　
D.a high emigration rate

单项选择题Ireland is unique among European countries for（）.

A.its small population
B.its beautiful scenery
C.its rich natural resources
D.its century-long population decline

单项选择题Ireland has the following demographic features except（）.

A.it has a low birthrate
B.it has a late marriage age
C.it has an excess of females in the population
D.it has a high proportion of bachelors and spinsters of all ages