The book states that the other two areas_______the two varieties of English differ are spelling and pronunciation .

A．which

B．that

C．in which

D．from which

男性患者，30岁，病程4个月，头痛发病，入院前出现左侧肢体无力和呕吐。入院检查，意识清醒，眼底视盘水肿，左上、下肢肌力四级，腱反射活跃，病理征（+）。

最有助于明确病因的检查是（）

A.X线头颅片

B.脑电图

C.脑血管造影

D.CT

E.ECT