Human facial expressions differ from those of animals in the degree __________ they can be controlled on purpose.

A．with which

B．to which

C．of which

D．for which

患者，男性，40岁，因门静脉高压症食管胃底静脉曲张出血，已行脾切除，贲门周围血管离断术1年，近2天来又有黑粪，每日4次，糊状，量每次150ml左右，血红蛋白80g／L，血压12／8kPa，应首先考虑作何种检查（）

A.急诊胃肠钡餐检查

B.急诊胃镜

C.先止血，待病人情况好转后再作胃镜检查

D.选择性动脉造影

E.经皮肝穿刺行门静脉造影