冠词填空。

1. His father, who is ______ honest man, is teaching in ______ university.

2. Which is heavier, ______ elephant or ______ horse?

3. ______ cold wind was blowing from the north.

4. He is always ready to help ______ old and ______ young.

5. ______ Greens are traveling in ______ South China.

诊断低位肠梗阻最可靠的证据是（）。

A.腹部平片示小肠多个阶梯状气液平

B.脐周可闻气过水音

C.阵发性腹痛伴腹胀

D.置胃管行胃肠减压后梗阻症状明显减轻

E.频繁呕吐、呕吐量大