题目

They won’t buy any new clothes because they _______ money for a new car.A. save               B. were saving      C. are saving                 D. have saved 答案：C有t℃的a g KCl不饱和溶液，其质量分数为w1，采取措施后使其变为b g饱和溶液，其溶质质量分数为w2，下列说法正确的是A．a一定小于或等于b B．aw1一定等于b w2 C．t℃时KCl溶解度一定大于100w1  D．w1一定大于w2