问题 单项选择题

关于去甲肾上腺素、肾上腺素、异丙肾上腺素的作用,错误的是()

A.扩张冠状血管

B.收缩压升高

C.心肌收缩力增强

D.具有平喘作用

E.过量可见心律失常

答案

参考答案:D

解析:由于三药均可激动心脏上的β受体,使心肌收缩力增强,收缩压升高,如果过量,心脏过度兴奋,可出现心律失常。另外心脏兴奋时,心肌的代谢产物(如腺苷)增加,可使冠状血管舒张,而且肾上腺素、异丙肾上腺素还可通过激动冠脉上的β受体,舒张冠状血管。但只有激动支气管平滑肌上的β受体,才能舒张支气管,所以去甲肾上腺素无平喘作用。

改错题

第二节短文改错(共10小题;每小题1分,满分10分)

此题要求改正所给短文中的错误对标有题号的每一行作出判断,如无错误,在该行右边横线上画一个勾(√);如有错误(每行只有一个错误),则按下列情况改正:

该行多一个词:把多余的词用斜线(\)划掉,在该行右边横线上写出该词,并也用斜线划掉。

该行缺一词:在缺词处加一个漏字符号(∧),在该行右边横线上写出该加的词。

该行错一个词:在错的词下面划一横线,在该行右边横线上写出改正后的词

When my eighteenth birthday came, I was not in home                 91. ___________

In order to celebrate such important day with my dear                   92. ___________

parents, I wrote a long letter, in which I thanked him                   93. ___________

for having raised me for 18 years, and expressed my                        94. ___________

love for them. Later, Mother talked me when she read the         95. ___________

letter, tears were filled her eyes. But Father appeared                   96. ___________

very cool.  After that, he studied it lonely carefully.                   97. ___________

Then he put it up into a desk drawer. I can imagine                             98. ___________

the scene clear because I know Father. Being a man                         99. ___________

with few words, he preferred to show his love for me in                      100.. ___________

a silent way.

单项选择题