The professor walked onto the platform and seated himself in a chair, ____ for answering questions.

A．had prepared

B．being prepared

C．preparing

D．prepared

根据《价格法》，国务院价格主管部门和其他有关部门制定关系群众切身利益的公用事业价格、公益服务价格时，应当( )。

A．举行价格听证

B．进行专家审议

C．经国务院批准

D．征求地方物价部门意见