The high ________of road accidents on the super highway is giving cause for serious concern.

A. coincidence  

B. occurrence

C. circumstance  

D. occasion

甘遂配牵牛子可用于

A．实热积滞，燥屎坚结
B．脘腹冷痛，大便秘结
C．腹水水肿，二便不通
D．津枯血少，肠燥便秘
E．虫积腹痛，大便秘结