I haven't heard from him_____ last year. [ ]
A. by
B. since
C. /
D. in
答案:B
世界上人口密度最大、人口自然增长率最低的大洲是[ ]
A.亚洲
B.欧洲
C.非洲
D.美洲
诊断急性肾盂肾炎最主要的依据是()
A.尿路刺激征
B.脓尿和菌尿
C.高热、寒战、腰痛
D.上输尿管肋腰点压痛
E.尿蛋白不多