单项选择题

She was so obstinate that she wouldn' t adjust her opinions.

A．inflexible
B．alert
C．wise
D．talented
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单项选择题
Many politicians find that they can no longer afford the luxury of a personal chauffeur.
A．valet
B．driver
C．secretary
D．servant
单项选择题
Differences in positions adopted by oxygen and hydrogen atoms account for variations in the crystalline structure of different forms of ice.
A．are caused by
B．explain
C．derive from
D．constitute
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