单项选择题

Throughout the empire of Kublai Khan, money made of paper was used for business, ______,
something unheard of in Europe.

A．transformations
B．transmissions
C．transitions
D．transactions
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单项选择题
The strong scent of Kate's perfume ______ the air in the small room.
A．radiated
B．permeated
C．extracted
D．dispersed
单项选择题
You can ______ the loudness of the radio by turning the knob to right or left.
A．change
B．vary
C．alter
D．transform
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