He came to a point _____ there was no more road to follow, and before him he could see nothing

but a thick forest. [ ]

A. that        

B. what        

C. which        

D. where

职业健康安全事故分两大类型，即( )。

A．职业伤害事故与职业病
B．机械伤害事故与职业中毒
C．触电事故与职业放射性疾病
D．物体打击事故与物力因素所致职业病