单项选择题

We need things consumed, burned up, worn out, replaced and ______ at an ever increasing rate.

A．canceled
B．dissipated
C．discarded
D．concealed
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单项选择题
In his speech he ______ on the importance of prompt action.
A．hesitated
B．lingered
C．retained
D．dwelt
单项选择题
Various types of packaging come into existence to ______ the market position of products.
A．amplify
B．foster
C．enhance
D．magnify
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