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
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
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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