单项选择题

People in the United States in the nineteenth century were haunted by the prospect that unprecedented change in the nation' s economy would bring about social chaos.

A．occupied
B．overwhelmed
C．obliged
D．obsessed
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单项选择题
Samples of this article will be sent to you free ______.
A．of accord
B．on request
C．for payment
D．in advance
单项选择题
Without a(n) liberal supply of necessary equipment and materials, the mountain-climbers would not have been able to scale the heights and reach the top in such bad weather.
A．lenient
B．free
C．casual
D．abundant
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