The seven principal kingdoms of Kent, Essex, Sussex, Wessex, East Anglia, Mercia and Northumbria in British history have been given the name of ____
A. the Missouri Compromise
B. The Canadian Broadcasting Corporation
C. the Potato Famine
D. Greater London
E. the European Communities
F. Heptarchy
G. citizenship
H. Inner London
I. the Canberra Pact
J. nonstatus
K. The British Privy Council
L. status
【正确答案】：F