问题
单项选择题
参照《企业职工伤亡事故分类》（GB6441-86），综合考虑起因物、引起事故的诱导性原因、致害物、伤害方式等，将危险因素分为（）类。
A.21
B.20
C.13
D.14
答案
参考答案：B
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参照《企业职工伤亡事故分类》（GB6441-86），综合考虑起因物、引起事故的诱导性原因、致害物、伤害方式等，将危险因素分为（）类。
A.21
B.20
C.13
D.14
参考答案：B
Passage Four
Under what circumstance can we tell an accident is probably caused by sleepiness
A．If traffic is light and vehicles are well-spaced on the road.
B．When there is only one car involved in the accident.
C．If there is no skid marks or other signs of braking on the road.
D．All of the above.