男性，18岁，发热伴头痛、呕吐2周入院，X线胸片示双肺弥漫性粟粒状密度增高影，为明确诊断，进一步要做的检查是（）

A.PPD

B.腰椎穿刺

C.肺部CT

D.脑电图

E.淋巴结活检

He is a new comer. There is no one _____, so let’s go and help him, shall we?

A．who to turn to

B．for him to turn

C．for whom to turn

D．he can turn to