题目

山东省临沂市2011年高三教学质量检测考试        I admit that there are problems. I don’t agree that they can not be solved.        A．While       B．As     C．Since D．Unless 答案：A解方程．4x-2.8x=1.2                            3x4=927x+2×3=13                             3：5=x：10．