No one responded when Tom was speaking, so he paused _______ before continuing to draw our attention.

A．deliberately

B．eagerly

C．sincerely

D．faithfully

从一患者痰中分离出一株细菌，血平板上灰白色，黏液型大菌落，用接种针可拉出长丝。革兰染色为阴性杆菌，氧化酶试验阴性，O/F试验为发酵型，苯丙氨酸脱氨酶试验阴性，动力阴性，此菌最可能是

A．大肠埃希菌

B．铜绿假单孢菌

C．肺炎克雷伯菌

D．痢疾志贺菌

E．伤寒沙门菌