选词填空。

1. Let          _ (I, me) clean the desk.

2. It's _       _ (rain, rainy) here.

3. What's the matter ______ (with, for) you?

4. Are those ______ (cow, cows) ?

5. It's hot             (in, at) Hong Kong.

男，45岁，因上呕下泻住某医院，每天静脉点滴庆大霉素16万单位共9天，近5天来少尿(200～300ml/d)，球结膜水肿，腹水，下肢水肿。实验室检查：血BUN38.6mmol/L，血肌酐1214mmol/L，血清钾6.9mmol/L

下列哪项检查对本例诊断最有帮助

A．KUB

B．病史及肾穿刺活检

C．B超

D．逆行肾盂造影