Despite high prices of the goods, the shopping mall is always attracting a lot of customers for

its ________ supplies.[ ]

A. diverse  

B. discount

C. abundant  

D. effective

关于肠道致病菌的主要属性错误的是（）

A.革兰阴性杆菌

B.兼性厌氧

C.在SS琼脂平板上形成红色不透明菌落

D.能分解多种糖类和氨基酸

E.可用免疫血清鉴定