锥虫感染宿主后常可引起哪些疾病()
A.锥虫下疳
B.出现广泛的淋巴结肿大、脾充血肿大
C.睡眠病
D.贫血
E.象皮肿
参考答案:A, B, C
Sir, you _______ be sitting in this waiting room. It's for women and children only. [ ]
A. oughtn't to
B. can't
C. won't
D. needn't
发现有人食物中毒,应查找购进渠道,向政府食品卫生监督部门进行投诉,待查证结束后,方可销毁封存食品。