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
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单项选择题
At the sight of the police officer, the thief ______.
A．got to his feet
B．took to his heels
C．rose to his feet
D．dragged his heels
单项选择题
The security of the passengers is supposed to ______ by the captain.
A．see to
B．seeing to
C．be seen to
D．seen to
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