单项选择题

An ______ is a set of beliefs, especially the political beliefs on which, people, parties, or countries base their actions.

A．ecology
B．ideology
C．idiom
D．academy
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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
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
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