单项选择题

Mexico is ______ the USA.

A． on the south of
B． on the north of
C． a part of
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单项选择题
The best title (题目) of the passage is
A． Mexico's population
B． Mexico City
C． Mexico
单项选择题
When the children were very young,______.
[A] they didn't know who Father Christmas was
B. they thought their father was Father Christmas
C. they knew that Father Christmas wasn't real
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