男性，65岁，COPD10年，近来症状加重伴呼吸困难。血气分析示：pH7.26、PaO₂52mmHg、PaCO₂78mmHg、HCO₃^-35mmol／L，该患者的酸碱失衡类型是（）.

A.呼吸性酸中毒失代偿

B.代谢性酸中毒失代偿

C.呼吸性酸中毒合并代谢性酸中毒

D.呼吸性酸中毒合并代谢性碱中毒

E.代谢性酸中毒合并代谢性碱中毒

完成对话。.

A: Can I 1.________ you?

B: Yes, please. I 2.________a pen.

A: How  3. ________ this black one?

B: It is nice, but I don't 4.________black.    

A: What 5.________ do you like?

B: I like red. Do you 6.________ red pens?

A: Yes. We have pens 7.________ all colors.

B: Let me have a 8.________ . This one is good. How 9.________ is it?

A: Five yuan and twenty fen.

B: OK. I'll 10.________ it. Here is the money.

A: Thanks