单项选择题

Her speciality is heart surgery.

A．region
B．site
C．platform
D．field
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单项选择题
Customers often defer payment for as long as possible.
A．make
B．demand
C．obtain
D．postpone
单项选择题
The industrial revolution modified the whole structure of English society.
A．destroyed
B．broke
C．changed
D．smashed
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