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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