Prices of food and clothing and almost everything else in the country have steadily gone up. As a result, the buying ______ of the dollar has gone down.

A．capacity

B．competency

C．power

D．value

无权代理是指欠缺代理权的人所做的代理行为。它包括（）。

A.不具备默示授权条件的代理

B.授权行为无效的代理

C.超出授权范围行事的代理

D.代理权消灭后的代理