正确答案: C

90mmHg

题目：动脉血氧分压正常参考值为( )

解析：C

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举一反三的答案和解析：

[单选题]______ he come, what you say to him?

Should, would

解析：

    15．答案为B  与将来事实相反的虚拟语气，只能选should。

[单选题]碳循环不平衡带来的环境问题是（ ）

温室效应

[单选题]1949年10月1日，中华人民共和国的成立，标志中国进入（ ）

新民主主义社会

[单选题]呼吸困难伴昏迷常见于下列各项，但除外 （ ）

胸膜炎

[单选题]

rulerB． rubber

[单选题]雕塑选用的材料直接决定着作品的质感，米洛斯岛的《维纳斯像》所用的材质是 ( )

大理石

[单选题]Passage ThreeEducation is not an end, but a means to an end. In other words, we do not educate children only for the purpose of educating them; our purpose is to prepare them for life. As soon as we realize this fact, we will understand that it is very important to choose a system of education which will really prepare children for life. It is not enough just to choose the first system of education one finds, or to continue with one's old system of education without examining it to see whether it is in fact suitable or not.

a means

解析：44．答案为B  此题为细节题。本文主要探讨教育问题。第一句就是主题句，给出了教育的定义。所以答案在第一段的第一句：Education is not an end，but a means to an end。