Among the five Great Lakes, only （）is wholly within the United States.

单项选择题The general election in America is held every （）years.

A.5
B.4
C.6
D.3

单项选择题The colonial life can be described as the following except （）

A.simple
B.easy
C.rough
D.hard

单项选择题In the west of the （）lie the Colorado Plateaus and the Columbia Plateaus.

A.Rocky Mountain
B.Coast Range
C.Cascades Mountains

单项选择题The Constitutional Monarchy started at the end of the （）century.

A.17th
B.16th
C.15th

单项选择题The Judicial Branch is headed by （）

A.the Supreme Court
B.Congress
C.President