鉴定幽门螺杆菌的主要依据是

A．以上都不对

B．定居于胃黏膜层中

C．运动活泼、生化反应活泼

D．产生大量的尿素酶，分解尿素为氨

E．革兰阴性无芽孢菌

— Liu Xiang had to give up the race because of his foot.

— ______ [ ]

A. What a shame!

B. Of course.

C. He was so careless.