单项选择题

The price of vegetables ______ according to the weather.

A．formulates
B．flourishes
C．fluctuates
D．frames
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单项选择题
He isn't legally responsible for his nephew, but he feels he has a moral ______ to help him.
A．observation
B．obligation
C．objection
D．obstruction
单项选择题
Countries within the European Economic Community grant certain commercial ______ to each other.
A．advantages
B．benefits
C．privileges
D．subsidies
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