单项选择题

Americans are highly ______ , and therefore may find it difficult to become deeply involved with others.

A．moving
B．mobile
C．movable
D．motional
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单项选择题
To celebrate the national day, there was a ______ fireworks display.
A．specific
B．spectacular
C．speculative
D．specialistic
单项选择题
The negotiations which ______ the signing of the treaty took place over a number of years.
A．preceded
B．prescribed
C．proceeded
D．processed
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