单项选择题

Canada does not have a state religion, and the separation of church and" state has been firmly upheld.

A．officially
B．formally
C．easily
D．solidly
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单项选择题
The concept of upward social mobility has been an abiding feature of American life.
A．enduring
B．unaffected
C．intriguing
D．observable
单项选择题
In the Mesozoic period, the upward thrust of great rock masses created the Rocky Mountains and the Alps.
A．collision
B．angle
C．push
D．erosion
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