问题 单项选择题

组胺激动受体后产生的效应不包括( )

A.支气管平滑肌收缩
B.毛细血管通透性降低
C.胃酸分泌增多
D.部分血管扩张

答案

参考答案:B

解析: 本题考查的知识点是组胺的效应。
[要点透析] 现知组胺受体有H1、H2和H3三种亚型,激动H1受体主要表现为支气管、胃肠道平滑肌兴奋收缩.毛细血管通透性增加和部分血管扩张等。激动H2受体主要表现为胃酸分泌增多和部分血管扩张。H3受体主要存在于神经系统,参与组胺合成与释放的负反馈性调节。

列举题
阅读理解

阅读理解。

Dear students,

     I'm very happy to be your guest speaker today. It's a great pleasure to visit your school and meet all

of you here.

     I would like to tell you about myself. I have been a reporter for the past fifteen years. I chose this job so

I could travel the world, but the job has taught me many unforgettable lessons. This work is sometimes

difficult. I have seen wars, earthquakes, poverty and death. But I have also seen courage, hope and happiness.

     In India, I visited a city, There were many homeless children in it. Some were young and lived in the streets. But then a kind lady called Rosa opened a home for them. In one whole year, she was looking after two

hundred children, feeding them, teaching them and giving them hope.

     Another time, I was in Japan after a terrible earthquake. In a place, I found an old lady. Her house fell

down. Her son could hardly be alive., But the lady didn't give up hope. For four days, she moved heavy

stones by herself. She didn't stop until she found her son. He was still alive.

     Here in China, I met a young boy with a serious illness. He had to have twenty operations in hospital.

But when I met him, he was still smiling.

     Now when my life is difficult, I always remember the courage of the three people.

1. The guest speaker has worked as a reporter for _________ years.

A. 13

B. 14

C. 15

2. From the passage, we know Rosa was _________.

A. kind

B. unfriendly

C. hopeless

3. _________ made the old lady in Japan find her son at last.

A. Happiness

B. Hope

C. Reporters

4. When the guest speaker is in trouble, she always thinks of _________.

A. boring travels

B. the courage of the three people

C. many homeless children

5. The passage above is _________.

A. an e-mail

B. a letter

C. a speech