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问题 单项选择题 A1/A2型题

关于COPD患者的家庭氧疗，叙述正确的是（）

A.低浓度吸氧：氧流量2～4L/min

B.一昼夜不少于10小时

C.夜间为避免影响休息，可间断、暂停吸氧

D.使PaO2≥80mmHg，使SaO2>90%

E.COPD以及慢性呼衰者提倡长期家庭氧疗

答案

参考答案：E

解析：COPD的家庭氧疗要求低流量低浓度吸氧，氧流量1～2L/min；一昼夜至少15小时，夜间不间断；使PaO2≥60mmHg，使SaO2>90%；一般COPD患者提倡长期家庭氧疗。

选择题

下列命题中，正确的是

①若a+b+c=0，则b2-4ac<0；

②若b=2a+3c，则一元二次方程ax2+bx+c=0有两个不相等的实数根；

③若b2-4ac>0，则二次函数y=ax2+bx+c的图象与坐标轴的公共点的个数是2或3；

④若b>a+c，则一元二次方程ax2+bx+c=0，有两个不相等的实数根。[ ]

A.②④

B.①③

C.②③

D.③④

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填空题


In the following passage, there are 25 blanks representing words that are missing from the context. You are to put back in each of the blanks with the missing word. Write your answers on the ANSWER SHEET. The time for this section is 25 minutes.
Compared with the immediate practical responsibility of the scientist, the (1) of the artist must seem puny. The decision which faces (2) is not one of practical action: of course he will try to throw this (3) into the scale, and that weight, if he is a writer or (4) a painter of genius, may have its effect. For the novelist—in our society the only artist who has a mass audience and at the same time effective economic control of the means of addressing (5) —the hope of some decisive influence is a reasonable (6) . For him, since he takes of all artists (7) is probably the largest portion of his culture as material, there is no (8) escape from the necessity for treating the content of his work seriously than (9) is for the social psychologist he is coming so closely to resemble. The dichotomy which people have tried to establish between artistic proficiency and (10) content is becoming unbearable to almost all sensitive minds. I doubt if it has ever been real— we might have admired Shelley as (11) if he had been indifferent to such things as war and tyranny, though I doubt it; certainly (12) he been indifferent we should never have been led by (13) .
There is no Hippocratic oath in literature, and I am not attempting to draw (14) up. As far as I am concerned, the artist is a human being writ large and his (15) are the ethics of any human being. Perhaps I can best illustrate (16) seems to me the new (17) of those duties of assertion and refusal from one writer, and I do not (18) it is without significance that this (19) projects the whole situation of choice into a scientific parable, the (20) of a pestilence: a (21) many human (22) are called to fight against, called not by any supernatural (23) but by the simple fact that the fight against a plague is (24) like a biological human (25) .
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