《危险化学品安全管理条例》规定：国家对危险化学品生产、储存实行（）制度。
A.审批
B.备案
C.报告
参考答案：A
_____ many times, but he still couldn't understand it. [ ]
A. Though he had been told
B. Having been told
C. Having told
D. He had been told
在保卫滕县战斗中，牺牲的川军将领、一二二师师长是[ ]
A．李宗仁
B．佟麟阁
C．赵登禹
D．王铭章
