慢性胃炎的主要致病细菌为（）

A.大肠埃希菌

B.沙门菌

C.幽门螺杆菌

D.空肠弯曲菌

E.嗜盐杆菌

Before going camping, we must discuss every thing-where to go, what to bring, when to start    .

A．such as

B．for instance

C．and so on

D．take examples