企业各级（）通过个人安全行动计划落实以身作则的良好个人安全行为。
A、职工
B、安全管理人员
C、领导干部
参考答案：C
-What do you think of his concert?
-Oh，no one does____．
A．good
B．well
C．better
D．best
—What color is your backpack?
—It's _____. [ ]
A. a green
B. blue
C. my green
