题目

It was ________ that we went camping on the mountain. A . such nice weather B . so nice a weather C . such a nice weather D . too nice weather 答案：A在一个不透明的口袋中装有若干个只有颜色不同的球，如果口袋中装有4个红球，且摸出红球的概率为，那么袋中共有球的个数为（ ）A．12个B．9个C．7个D．6个