单项选择题

This is a new model of ______ typewriter especially designed to meet the needs of traveling businessmen.

A．flexible
B．mobile
C．portable
D．active
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单项选择题
He's so crazy about her that he doesn't realize he's being ______.
A．manifested
B．magnified
C．manipulated
D．maintained
单项选择题
During the 18th century land was cheap, grain was plentiful, and meat was ______.
A．abundant
B．sufficient
C．enough
D．adequate
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