In our class there are 73 students, ____ half wear glasses.

A．in whom

B．of them

C．in them

D．of whom

患者，男性，40岁，用力排便后突发左-上腹剧痛1小时，伴胸闷气急，来院急诊，查体：左上腹压痛明显，全腹肌紧张(±)，Bp90/40mmHg，P128次/分，R33次/分，自诉五天前曾有左上腹外伤史，当时无严重不适。为明确诊

A．CT

B．腹部平片

C．上消化道吞钡造影

D．B超

E．胸片