传染病的基本特征包括（）
A.有传染性
B.有病原体
C.有流行病学特征
D.有感染后免疫
E.一般都有后遗症
参考答案：A, B, C, D
—I didn't see you when I came here last night. Where were you?
—I _______ my project at home. [ ]
A. designed
B. have designed
C. would design
D. was designing
男性，50岁，发热、贫血、消瘦3个月，阵发性右下腹痛转为持续性，腹泻黏液血便，右下腹触及包块，诊断上可能性最大的是
A．肠结核
B．慢性阑尾炎
C．．肠套叠
D．升结肠癌
E．右髂窝脓肿
