The boy was caught_______ in the examination and was punished by the teacher.

A．having cheated

B．cheated

C．cheating

D．cheat

男性，12岁，昨晚进食海鲜，今晨开始畏寒、发热、腹痛，以左下腹甚，腹泻伴明显里急后重，大便8次，初为稀便，继之为粘液脓血便，诊断为急性细菌性痢疾。对该病例首先采用的抗菌药物是

A．四环素

B．喹诺酮类

C．氯霉素

D．庆大霉素

E．呋喃唑酮