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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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
It is a general belief in American society that Asian or Asian-American parents are able to instill into their children a much greater incentive to work.
A．encouragement
B．motivation
C．inducement
D．inspiration
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