I bought a pair of running shoes because I want to _______ the teachers' relay race.[ ]

A.join

B.join in

C.take part

D.have part in

可确诊支气管扩张的诊断方法为（）

A.支气管造影

B.支气管镜检查

C.详细的病史

D.肺部前后位X线片

E.用上述检查方法均无效