单项选择题

The voluntary decision to label seems to have been rewarded.

A．paid out
B．paid back
C．paid up
D．paid off
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单项选择题
The entire process is called the greenhouse effect, and most of it is caused by the prevalent greenhouse gas, water vapor.
A．predominant
B．executive
C．superior
D．remarkable
单项选择题
The dispute between the faculty and the administration was not resolved until the faculty members got better working conditions.
A．threat
B．disquisition
C．problem
D．argument
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