There was________time________Iraq was one of the richest countries in the world.[ ]

A．a；when  

B．a；that

C．the；that

D．the；when

一般需经3～4周培养才能见到有细菌生长的细菌是

A．结核杆菌
B．淋球菌
C．空肠弯曲菌
D．炭疽菌
E．军团菌