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问题 单项选择题

体内CO2分压最高的是

A．静脉血液

B．毛细血管血液

C．动脉血液

D．组织液

E．细胞内液

答案

参考答案：E

解析：
[考点] 组织换气和CO2的运输
[分析] 在细胞中，由于细胞有氧代谢，O2被利用并产生CO2，所以细胞内液CO2分压最高。按照从分压高向分压低处的弥散方向，组织液的CO2分压位居第二，以后是毛细血管血液、静脉血液。血液经过肺循环后，大量CO2排出体外，故动脉血中CO2分压最低。

名词解释

寄生虫机械性损害
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单项选择题

Nasreddin had a shed(棚子)behind his house. It had no lights in it. One night he went out to the shed to get his ladders(梯子)and lost his ring(戒指)there. He left the ladder, went out into the street and began to look around.
One of his friends saw him in the street outside his house, and said to him, " Hello, Nasreddin, what are you looking for"
"My ring , "answered Nasreddin. "It fell off my finger. It is a silver(银的)ring with a red stone in it." "Oh, yes. "said the friend. "I remember it. I will help you to look for it. Where did you lose it"
"In my shed."
"But why don’t you look for it there"
"Don’t be foolish! It is quite dark in my shed, how can I find my ring there Here there is light from the lamps in the street.\

Nasreddin was looking for his ring ______.
A. in his house B. in the street C. behind the house
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