患者男，49岁，因胸痛、呼吸困难3h入院，既往有高血压病史，入院前口服硝酸甘油无效。入院后体检发现CK-MB34.0ng/ml，肌钙蛋白4.21ng/ml，肌红蛋白28.0ng/ml。

根据患者上述表现，最可能的临床诊断是（）

A.不稳定性心绞痛

B.急性肺栓塞

C.急性心肌梗死

D.自发性气胸

E.急性主动脉夹层

F.急性非特异性心包炎

In salad bars the waiter does not bring you salad. You have to____ yourself, usually to as much as you want.

A．bring

B．serve

C．help

D．supply