单项选择题
A.elective B.democratic C.hereditary
A.Potomac B.Delaware C.St. Laurence
A.The Cabinet B.The Supreme Court C.President D.Congress
A.Philadelphia B.Boston C.New York
A.Erie B.Superior C.Michigan
A.5 B.4 C.6 D.3
A.simple B.easy C.rough D.hard
A.Rocky Mountain B.Coast Range C.Cascades Mountains
A.17th B.16th C.15th
A.the Supreme Court B.Congress C.President
A.1620 B.1607 C.1776