单项选择题

Stunned by what had happened, the old man stood rooted ______.

A．on the spot
B．to the spot
C．on the ground
D．to the ground
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单项选择题
The bad weather will ______ our plans by three weeks.
A．destroy
B．pull back
C．spoil
D．Set back.
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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