题目类型：
填空题
题目内容
______forms a natural boundary between Mexico and the US.
A. The Rio Grande River
B.“money bills
C. The Trans-Canada Highway
D.“open-field”
E. St. Patrick
F. Roundheads
G. The Hume Highway
H. Aotearoa
I. Aborigines
J. Nunavut
K. the Bill of Rights
L. the Ku Klux Klan
A. The Rio Grande River
B.“money bills
C. The Trans-Canada Highway
D.“open-field”
E. St. Patrick
F. Roundheads
G. The Hume Highway
H. Aotearoa
I. Aborigines
J. Nunavut
K. the Bill of Rights
L. the Ku Klux Klan
正确答案
A