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问题 单项选择题

给病人补充液体时，常静脉注射0.9%的NaCl水溶液(生理盐水)。这说明( )。

A．无机盐离子随水分一同进入细胞
B．此浓度的溶液易被病人吸收
C．此浓度的无机盐溶液可以维持细胞及周围环境的稳定
D．此浓度的无机盐溶液可以促进细胞吸水

答案

参考答案：C

解析： 生理盐水的浓度与体液的浓度一致。

阅读理解
Harry’s father bought a magazine which gave its readers information about all kinds of products and helped them make the best choice while buying．
Harry borrowed his father’s magazine when he needed a new computer．“I’ll read it and choose the best one．” He said．
The magazine described these computers．
The DGT PC450
The BNK 975XF: AT $3，200
The CGP 8PT

This computer comes with lots of good software. However it does not have much memory and is rather slow．At $2，850 it’s not very good value for money.

This is the most expensive computer we tested．However it is also far the most reliable (可靠的)．It is very fast and has lots of memory．It is worth the extra money if you can afford it．

At only $1，900．It has lots of money and is quite fast．However it broke down twice while we were testing it and we cannot recommend (建议) it for reliability．
Harry chose the BNK 975XF．“I know it’s expensive，” he said，“but it will be with me for a long time and do everything I want it to do．”
小题1:Harry wants to buy a computer，so he borrowed ________ from his father．
A．a computer magazineB．a magazine about all kinds of products
C．a shopping bookD．a book about all kinds of computers
小题2:________ doesn’t have much memory and is rather slow．
A．The DGT PC450 B．The BNK 975XF
C．The CGP 8PTD．Harry’s computer
小题3:The CGP 8PT is ________ among the three kinds of computers．
A．the fastestB．the most expensive
C．the cheapestD．the slowest
小题4:Harry chose the BNK 975XF because ________．
A．it is the most expensiveB．it has lots of good software
C．it has much memoryD．it would work for him for a long time
小题5:．________ helped Harry to choose the computer．
A．His fatherB．His friendC．The shopkeeperD．The magazine
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填空题

氯乙烯在设备管道中一般液体流速不易超过（）m/s，气体不易超过（）m/s。
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