志贺菌属根据O抗原的不同，可分为4群，其中A群是

A．痢疾志贺菌
B．福氏志贺菌
C．宋内志贺菌
D．鲍氏志贺菌
E．沙氏志贺菌

Which of the following best shows the speaker’s feeling

A．We won a very close competition.

B．Our firm is the best one by far.

C．It’s a pity we didn’t open a downtown office.

D．Their firm didn’t open even one branch office downtown.