________ and short of breath, Andy and Ruby were the first to reach the top of Mount Tai.

A．To be tired

B．Tired

C．Tiring

D．Being tired

可协助诊断血胸的检查是（）

A.血常规

B.胸部X线片

C.胸部B型超声

D.胸腔穿刺

E.胸部CT