问题 单项选择题 A1/A2型题

下列关于维拉帕米描述错误的是()

A.属于钙通道阻滞药

B.经口吸收迅速而完全,无首关效应

C.阻滞心肌细胞膜慢钙通道,抑制Ca2+内流,抑制窦房结和房室结慢反应细胞

D.抑制4相缓慢除极,使自律性降低

E.对阵发性室上性心动过速治疗效果较好

答案

参考答案:B

解析:维拉帕米经口吸收迅速而完全,但首关效.应强,生物利用度仅10%~35%;药理方面:阻滞心肌细胞膜慢钙通道,抑制Ca2+内流,抑制窦房结和房室结慢反应细胞;抑制4相缓慢除极,使自律性降低;不降低房室结O相除极速度和幅度,使房室传导减慢,ERP延长。在临床上对阵发性室上性心动过速治疗效果较好。

阅读理解

阅读理解。

                                             Are You Still Looking for Your Son?

      Mrs. White has a son. His name is Sam White. The young man begins to work in a post office in

a city this Autumn. He asks his mother to visit the city. The old woman is happy and catches a train.

She soon arrives in the city, but she doesn't know where the post office is. She begins to look for it,

but she can't find it. At a bus stop she asks an old man, "Excuse me, sir. How can I get to the post

office?" 

      "There are about forty post offices in our city," says the old man."Which one do you want to find?"

      The old woman gives Sam's letter to him and the old man says, "Walk along this street and take the

fourth turning on the left. His post office is just there."

       Mrs. White thanks the old man and soon finds her son. They are very happy. A week later the

woman goes to the zoo. She sees all kinds of animals. But she can't remember the way back to the post

office. At the same bus stop she meets the same old man and she asks the same question again.

      "Oh dear!" the old man says. "Are you still looking for your son?"

1. Where does Sam White work?

     ____________________________________

2. How does Mrs. White go to the city?

     ____________________________________

3. Does the old woman know how to get to her son's post office?

    ____________________________________

4. How many post offices are there in this city?

    ____________________________________

5. Does the old man think Mrs White found her son's post office?

    ____________________________________

单项选择题