单项选择题
With prices （）so much, it is difficult for the school to plan a budget.
A．vibrating B．fluctuating C．fluttering D．swinging
单项选择题 Many types of rock are （）from volcanoes as solid, fragmentary material.
单项选择题 He raised his eyebrows and stuck his head forward and （）it in a single nod, a gesture boys used then for O. K. when they were pleased.
单项选择题 The ball （）two or three times before rolling down the slope.
