安全生产检查制度具体体现了( )的精神。
A．安全第一 B．预防为主 C．综合治理 D．违者必究
参考答案：B
The manager of the company told us that very little ____ was made of second-hand textbooks in the past. [ ]
A. energy
B. view
C. use
D. sense
如何掌握榆红胸三节叶蜂的危害规律？
