题目

如图5所示，重物所受到的重力和塑料板对它的支持力是一对           ；当塑料板上压的重物越重，塑料板的弯曲程度        ，重物所受到的支持力        。 答案：平衡力、越大、越大Last year my old college friend Melissa _________ her family business, a company supplying metal boxes to other factories.A．took upB．took downC．took offD．took over