问题 单项选择题 A1/A2型题

有关阴离子间隙(AG)描述错误的是().

A.AG是指血清中所测的阳离子总数和阴离子总数之差计算而出

B.计算公式AG=(Na++K+)-(Cl-+HCO3-

C.可化简为AG=Na+-(Cl-+HCO3-

D.AG对代谢性酸中毒的病因及类型的鉴别诊断有一定价值

E.根据AC水平高低可以判断呼吸性酸中毒的病因

答案

参考答案:E

解析:临床AC升高多见于代谢性酸中毒的全过程,是判断代谢性酸中毒病因的指标,并可作为诊疗的参考。

阅读理解

阅读理解。

     It may help you to know that there is no such thing as a perfect speech. At some point in every speech,

every speaker says something that is not understood exactly as he has planned. Fortunately, the moments are

usually not obvious to the listeners. Why? Because the listeners do not know what the speaker plans to say.

They hear only what the speaker does say. If you lose your place for a moment, wrongly change the order

of a couple of sentences, or forget to pause at a certain point, no one will be any the wiser. When such

moments occur, don't worry about them, just continue as if nothing happened.

     Even if you do make an obvious mistake during a speech, that don't really matter. If you have ever listened

to Martin Luther King's famous speech -"I have a dream", you may notice that he stumbles (结巴) his words

twice during the speech. Most likely, however, you don't remember. Why? Because you were fixing your

attention on his message rather than on his way of speech-making. People care a lot about making mistakes in

a speech because they regard speech-making as a kind of performance rather than as an act of communication.

They feel the listeners are like judges in an ice-skating competition. But, in fact, the listeners are not looking

for a perfect performer. They are looking for a well-thought-out speech that express the speaker's ideas clearly

and directly. Sometimes a mistake or two can actually increase a speakers' attractiveness by making him more

human.

     As you work on your speech, don't worry about being imperfect. Once you free your mind of this, you will

find it much easier to give your speech freely.

1. The underlined part in the first paragraph means that no one will _____. [ ]

A. be smarter than you

B. notice your mistakes

C. do better than you

D. know what you are talking about

2. You don't remember obvious mistakes in a speech because _____. [ ]

A. your attention is on the content

B. you don't fully understand the speech

C. you don't know what the speaker plans to say

D. you find the way of speech-making more important

3. It can be inferred from the passage that _____. [ ]

A. giving a speech is like giving a performance

B. one or two mistakes in a speech may not be bad

C. the listeners should pay more attention to how a speech is made

D. the more mistakes a speaker makes, the more attractive he will be

4. What would be the best title of the passage? [ ]

A. How to Be a Perfect Speaker

B. How to Make a Perfect Speech

C. Don't Expect a Perfect Speech

D. Don't Expect Mistakes in a Speech

5. Which of the following statements is true? [ ]

A. If you are careful enough, you can make a perfect speech.

B. Speech-making is a kind of performance.

C. Listeners are not judges and they pay more attention to the message.

D. Martin Luther King is not a good speaker.

填空题