单项选择题

With prices ______so much, it is difficult for the school to plan a budget.

A．vibrating
B．swinging
C．fluctuating
D．fluttering
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单项选择题
The person who______ this type of approach for doing research deserves our praise.
A．generated
B．originated
C．speculated
D．manufactured
单项选择题
Many types of rock are __ from volcanoes as solid, fragmentary material.
A．ejected
B．injected
C．propelled
D．flung
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