单项选择题

It will be hard for anyone to replace Mr. Ned, who is the ______ of the company.

A．mental
B．comprehension
C．brain
D．attendance
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单项选择题
Unlike science, progress in technology must be measured in terms of the human factor. Technology must be our slave and ______.
A．not the reverse
B．not the version
C．not the same
D．not the prejudice
单项选择题
Mr. Green has recently been ______ of the company.
A．appointed to president
B．appointed president
C．appointed a president
D．appointed the president
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