When I came ________ with the teenager hidden in the cave, I was surprised to find him ________ covered with dust.

A．face-to-face; entirely

B．face to face; entire

C．in face of; completely

D．face to face; entirely

为及时明确呕血的原因，应首选用的方法是

A．上消化道双重对比造影
B．上消化道内镜检查
C．选择性腹腔血管造影
D．MRI检查
E．CT检查