Which statement is NOT true about Ireland?（）
Ireland is divided into two political units.
Northern Ireland is part of the United Kingdom.
The Republic of Ireland is an independent country.
Ireland is called the Emerald Isle because of its rich deposit of emeralds.
爱尔兰又称“绿宝石岛“由于全岛被一片苍翠碧绿的林木所覆盖，故有“绿宝石岛”的美称。所以D错误。
