老年人皮肤瘙痒的最常见原因是（）
A.皮肤干燥
B.皮肤感染
C.慢性肾功能衰竭
D.高血压
E.药物过敏
参考答案：A
-Bad luck! It's too late.
-It doesn't matter. The movie _______ for only a few minutes. You can't miss it.
A．has begun
B．has been on
C．began
D．was on
单点测斜时，发生溢流（井喷），如何实施应急行动？
