It is fairly common in Africa for _____ a group of musicians surrounded by others who also join in the performance.

A．there are

B．there being

C．there to be

D．there be

男，67岁。近2个月来常有干咳，无咯血及痰中带血。2天前受凉后发热38.5℃，伴胸痛。体格检查示左下肺呼吸音减弱。胸片示左下肺外周有一直径3cm块状影，分叶状，边缘有毛刺。

为进一步明确诊断，可采用的检查是（）

A.CT

B.经胸壁肺穿刺活检

C.核素扫描

D.痰细菌培养

E.纤维支气管镜