某呼吸衰竭患者，近日来感染加重，发绀明显，自述有上腹胀痛，大便次数增多，颜色变深。查

短文改错(10分)

I’m glad to write to you. It is near a month since you had left our hospital. I’m still worried about you. How are you get along these days? I think you may be much better now, but I’d better have a good rest and take good care of yourselves since you are sixty-year-old man. I still remember those days which you helped me to my English. With your help, I make good progress. But to my regret, my English remains very poor through I have made good use of my time. Can you give me some advice on it?

精力旺盛、表里如一、刚强、易感情用事，这是什么气质类型的特点______。

A．胆汁质

B．黏液质

C．多血质

D．抑郁质

对于旅行社质量保证金的缴纳，在《旅行社条例》中是如何规定的

古代“银针验毒”的原理是：4Ag+2H₂S+O₂═2X+2H₂O，X的化学式为[      ]

A．AgS

B．Ag₂O

C．Ag₂S

D．Ag₂O₂

为什么煤矿工程要严格执行安全设计审查和验收制度？