单项选择题

To acquire education is principal way of gaining status in a culture that generally stresses achievement, skillfulness, and upward ______.

A．mobility
B．motivation
C．ambition
D．promotion
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单项选择题
Every device______ in the spacecraft must be designed and made with great care so as to be sure that nothing goes wrong in operation.
A．to be fitted
B．fitted
C．fitting
D．to have been fitted
单项选择题
I don't believe you are going to have the matter looked into today,______
A．are you
B．do you
C．arch' t you
D．don' t you
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