病害的流行
参考答案：
病害在短时间内大面积发生、迅速流行危害严重。
— Shall we go out this weekend?
— Oh, with so much work ____, I don't know if I'll have time to go out. [ ]
A. to do
B. doing
C. done
D. do
苯酚不能使湿润的石蕊变色，说明苯酚的酸性（）。
