如图，已知在平面直角坐标系xOy中，O是坐标原点，点A是函数y=$\frac{1}{x}$（x＜0）图象上一点，AO的延长线交函数y=$\frac{k^2}{x}$（x＞0，k是不等于0的常数）的图象于点C，点A关于y轴的对称点为A′，点C关于x轴的对称点为C′，交于x轴于点B，连结AB，AA′，A′C′．若△ABC的面积等于6，则由线段AC，CC′，C′A′，A′A所围成的图形的面积等于（　　）

    Mrs. Green doesn't like sports. She has much work to do at home. Her mother is coming this afternoon and she goes to meet her. Near the school she looks at her watch. She has some time. So she goes into the school. Her son isn't in the classroom. She asks a boy and knows they're behind the school. She sees some boys playing there. Her son is there too. She watches them playing and soon she's angry. She takes her son to the wall. “Go home with me, Richard.” She says, "Don't play with them. I can buy a nice ball for you. Then you don't need to scramble for the ball."

在轿车行驶过程中，以轿车为参照物，路边的树木是____ 的（选填“运动”或静止“），司机能通过车内的后视镜看到乘客，这是光的____ 现象（选填“反射”或“折射”）；在轿车刹车过程中，车轮表面的温度会升高，这是通过____ 的方式改变其内能．

读下列某河流示意图，图中乙处瀑布最终可能会消失的原因是(    )