单项选择题

Reagan pushed through the （）of oil and gasoline prices and received huge contributions from the oil companies.

A.deregulation
B.surrendered
C.thunder-struck
D.impenetrable

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单项选择题

Potential energy that is not so obvious as kinetic energy exists in many things.（）

A.许多事物中都包含不如动能明显的势能。
B.不如动能明显的势能存在于许多事物中。
C.势能虽然不像动能那样明显，但它存在于许多物体之中。
D.当势能不像动能那样明显时，便可在许多物体中找到它。

单项选择题

The conference was （）by one hundred experts in this field.

A.announced
B.declined
C.attended
D.planned