伤亡事故发生后，负伤者或事故现场有关人员应当（）或逐级报告企业（）。
参考答案：立即直接，负责人
Plastic bags are provided for our convenience but they have also ___ the pollution of the environment.[ ]
A. adapted to
B. turned to
C. contributed to
D. looked forward to
何时设集水器？
