单项选择题

This program ______ computer files so they can be easily sent by email.

A．suppresses
B．compresses
C．presses
D．impresses
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单项选择题
Being unable to find the key, I ______ the lid off the box with a stick.
A．leased
B．levered
C．pulled
D．hoisted
单项选择题
The president did not ______ a date for his visit to Peru.
A．specify
B．signify
C．identify
D．recognize
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