急性肾小球肾炎的三大严重症状有 _________ 、 _________ 和 _________ 。
参考答案：严重循环充血高血压脑病急性肾功能不全
已知关于x的一元二次方程（k-2）x2+3x+k2-4=0有一个解为0，则k的值为（ ）
A．±2
B．2
C．-2
D．任意实数
My son is very shy, but can you imagine ____ at the English party? [ ]
A. him sing
B. his singing
C. him to sing
D. his to sing
