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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Such essentially different stimulus cold,drugs,and grief can provoke identical chemical reactions in the body.
A．illness
B．weather
C．sorrow
D．travel
单项选择题
Salesmanship is the ability to sway people to willingly buy products or support new ideas.
A．educate
B．expect
C．allow
D．persuade
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