c____ke 蛋糕
— It's dangerous to swim here. Look at the sign.
— Oh, I notice it. Thanks for telling me.
贝多芬用人们难以忘怀的音调全力颂扬“人有权决定自身命运”这一时代信念。据此判断贝多芬音乐的主旋律是（ ）
