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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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
At first, the______ of color pictures over a long distance seemed impossible, but, with painstaking efforts and at great expense, it became a reality.
A．transaction
B．transmission
C．transformation
D．transition
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