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
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
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
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