问题 单项选择题 B型题

氧摄取率()

A.反映心肺功能和血红蛋白的量水平

B.代表组织实际需氧量

C.反映机体对氧的需求量

D.反映组织呼吸与微循环灌注及细胞内线粒体功能

E.反映全身组织水平氧供和氧耗的平衡

答案

参考答案:D

解析:1.SvO2为来自全身血管床的混合静脉血氧饱和度的平均值,代表全身组织水平氧供和氧耗的平衡。2.DO2为每分钟心脏向外周组织输送的氧量,反映心肺功能和血红蛋白水平。3.氧消耗即每分钟机体实际的耗氧量,在正常情况下,反映机体对氧的需求量,但并不代表组织的实际需氧量。4.氧摄取率指组织从血液中摄取氧的能力,反映组织呼吸与微循环灌注及细胞内线粒体功能。

阅读理解
阅读理解。
       Imagine you receive an e-mail that looks something like this: ARE YOU GOING TO CLASS TODAY?
How does reading this message make you feel? Why did the sender use all capital letters? Was he or she
angry, or did that person just forget to turn off the 'Caps Lock' on the computer? The fact is, this e-mail
'sounds' like the writer is shouting because using all capital letters in an e-mail is usually the way that people
shout online.
        Knowing when and when not to use capital letters is just one example of online etiquette (规矩) often
called netiquette. Virginia Shea's book, Netiquette, lists a basic set of dos and don'ts for communicating
(交流) rightly with others online. Following are some of her suggestions. 
        First, always remember that you are sending messages to a real person, not just to a computer. Don't
type anything that you wouldn't say to someone's face. Also, remember that the person who receives your
message cannot hear the tone of your voice, or see the expression on your face, so make sure your meaning
is clear. 
       Don't do anything online that you wouldn't do in real life. Don't take anything without paying for it,
unless it's free. Don't use information that someone else has written, and say it's yours. Don't read other
people's e-mail-you wouldn't open your next-door neighbor's mailbox and open their mail, right? Do share
your knowledge of the Internet with others. It's a big place with lots of information, and there are many new
things to discover.
       Remember that people think about you by your words as well as your actions, so do try to write well.
Good writing skills, as well as correct grammar and spelling, do matter. Send polite, well-written e-mail
messages to others. If you're uncertain about how to spell a word or which phrase to use, look it up. There
are lots of helpful books and websites.
        It's okay to express your opinions online in forums like chat rooms or message boards, for example
"MSN" or "QQ", but don't start arguments with people. 'Flame wars' (网上论争) in online discussions can
be interesting to read, but are often unfair (不公平) to other members of the group. Express your ideas, but
remember that fighting (打架) on or offline is just not right. 
        When you're online, just as in 'real' life, try to respect other people's space, privacy, and feelings.
Remember, you're not the only one traveling on this highway!
1. Using all capital letters in an e-mail means _______.
[ ]
A. shouting
B. laughing
C. pardoning
D. talking
2. Make sure your meaning in e-mails is clear because _______.
[ ]
A. the receiver can't see you or hear you
B. the e-mails are usually very short
C. it is easy to cause "flame wars"
D. e-mails are difficult to understand

3. From the last paragraph, we know that _______.

[ ]
A. besides us, there are many other people traveling on a highway
B. when we are online, we should think of other people and leave them enough time and room alone
C. we should follow the traffic rules when we are traveling on a highway
D. If we are online, we are in a real life
4. What is the best title for the passage?
[ ]
A. The Information Highway
B. How to Write a Good E-mail
C. Netiquette-Internet Dos and Don'ts
D. Don't Use Capital Letters In E-mails
单项选择题