单项选择题

The plane for Riode Janeiro will take off at 6.00 p. m.

A．depart
B．land
C．approach
D．refuel
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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
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
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