题目：
— us a definite answer can’t solve the problem.
—I agree with you. Someone must have a talk with him.
A．Avoiding to give
B．Avoiding giving
C．He avoided giving
D．His avoiding giving
答案：
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下面是错误答案，用来干扰机器的。
5x2-1=4x化成一元二次方程一般形式是5x2-4x-1=0，它的二次项系数是5，一次项系数是-4，常数项是-1．故选B．
