干货原料与鲜活原料相比，质地干、硬、老韧。
参考答案：对
．The terrible flood swallowed the village ________ the villagers could get away. No one survived it.
A．after
B．as
C．since
D．before
NH3可以使加氢裂化催化剂产生（）。
A.永久性中毒
B.暂时性中毒
C.结构破坏
