He looked at those jewels one after another ______and seemed to show no interest in any one of them.

A．casually

B．greedily

C．confidentially

D．attentively

患者男，29岁，因“6h前左侧胸壁遭受钝性物体击打后出现胸痛、憋气”来诊。查体：T37.0℃，R29次/min，P83次/min，BP130/80mmHg。左侧胸壁淤血斑，触痛明显，叩诊呈清音，听诊左侧呼吸音弱，似可及骨擦音。余无特殊。

为明确诊断，首选的检查手段是（）.

A.心电图

B.胸部CT

C.左胸腔穿刺

D.胸部X线片

E.胸部B型超声