Halloween is ______. [ ]
A. on October
B. in October
C. on October 31st
D. B and C
答案:D
机动车在高速公路上发生故障时,车上人员应当迅速转移到故障车前方躲避。
牡丹皮药用部位是茎皮,内表面常见白色发亮的小结晶,系牡丹酚结晶。