问题 单项选择题

禁食12h后,正常人血浆三酰甘油主要存在于()

A.CM

B.LDL

C.HDL3

D.VLDL

E.HDL2

答案

参考答案:D

解析:临床评估血脂的一种有用的方法是病人禁食12h后测定血浆TC、HDL-胆固醇和三酰甘油水平,将标本放入4℃冰箱过夜后,如果血浆较浑浊,则为VLDL增高,如果血浆较清,则TC升高是由LDL或HDL增高所致,如果有一层乳油状物形成,则肯定是乳糜微粒升高的结果,载脂蛋白的分析和电泳通常是不必要的。

单项选择题 B1型题
阅读理解

阅读理解。

     An idea came to me, and I turned off the lights in the studio. In the darkness, I took off my shirt and took

up the cello (大提琴); it was the first time in my life I'd felt the instrument against my bare chest. I'd never

thought about that; music scholars always talk about the resonating properties (共振) of various instruments,

but surely the performer's own body must have some effect on the sound. As I dug into the notes I imagined

that my own chest and lungs were extensions of the sound box; I seemed to be able to change the sound by

the way I sat, and by varying the muscular tightness in my upper body.

     After improvising for a while, I started playing, still in the darkness. I heard the music through my skin.

For the first time I didn't think about how it would sound to anyone else, and slowly, joyfully, gratefully, I

started to hear again. The notes sang out, first like a trickle, then like a fountain of cool water bubbling up

from a hole in the middle of a desert. After an hour or so I looked up, and in the darkness saw the outline of

the cat sitting on the floor in front of me, cleaning her paws and purring loudly. I had an audience again,

humble as it was.

     So that's what I do now with my cello. At least once a day I find time to tune it, close my eyes and listen.

It's probably not going to lead to the kind of comeback I'd be thirsty for-years of playing badly have left scars

on my technique-but I might eventually try giving a concert if I feel up.to it. Occasionally I feel a stab of

longing, and I wish I could give just one more concert on a great stage before my lights blink off, but that

longing passes more quickly now. I take comfort in the fact that, unlike the way I felt before, I can enjoy

playing for myself now. I feel relaxed and expansive when I play, as if I could stretch out my arms and reach

from one end of the apartment to the other. A feeling of completeness and dignity surrounds me and lifts me

up.

1. The writer put the cello against his bare chest to _____.

A. test music scholars' ideas about the resonating properties

B. experience the effect of his body on the musical sound

C. reduce his muscular tightness in his upper body

D. check the function of the sound box

2. In Paragraph 2, the writer intends to _____.

A. explain his feelings of playing before a cat

B. identify specific pieces of music he played

C. express his feelings of playing against his body

D. describe the sound when he played against his body

3. From the last paragraph we can infer that the writer was _____.

A. optimistic

B. discouraged

C. nervous

D. enthusiastic

4. The passage is mainly about _____.

A. a musician playing the cello for an audience

B. a musician's feelings when playing the cello

C. a musician finding joy in playing music in a new way

D. a musician's desire to return to his former profession