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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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
单项选择题
Such essentially different stimulus cold,drugs,and grief can provoke identical chemical reactions in the body.
A．illness
B．weather
C．sorrow
D．travel
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