单项选择题

The microscope can ______ the object 100 times in diameter.

A．magnify
B．increase
C．develop
D．multiply
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单项选择题
He gave a brief ______ of the history of the university before the opening of the conference.
A．reference
B．statement
C．account
D．comment
单项选择题
Abraham Lincoln insisted that ______ not just on mere opinion but on moral purpose.
A．to base democracy
B．democracy be based
C．for democracy to be based on
D．whenever democracy is based
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