If you have some difficulties ____ your grammar, you had better ask your teacher ____.

A．in; on some advice

B．for; for some advices

C．on; some advice

D．with; for some advice

“消费者总是力求通过决策方案的选择、实施、取得最大效用，使某方面需要得到最大限度的满足”。这种消费者决策的基本原则是( )

A．最大满意原则

B．相对满意原则

C．遗憾最小原则

D．预期满意原则