（）that the demand for power continues to rise at the current rate, it will not be long before traditional sources become inadequate.

单项选择题The person who （）this type of approach for doing research deserves our praise.

A．originated
B．speculated
C．generated
D．manufactured

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