问题
单项选择题
普萘洛尔减慢心率的机制是
A．激动心脏β1受体
B．激动神经节N1受体
C．阻断心脏β1受体
D．阻断交感神经末梢突触前膜瓤α2
E．扩张外周血管，经减压反射
答案
参考答案：C
搜题请搜索小程序“爱下问搜题”
普萘洛尔减慢心率的机制是
A．激动心脏β1受体
B．激动神经节N1受体
C．阻断心脏β1受体
D．阻断交感神经末梢突触前膜瓤α2
E．扩张外周血管，经减压反射
参考答案：C
Stress （压力） is everywhere in our everyday life. Not only men have it, but also women and young people. The most important reasons of stress are：death, diseases, exams, making money, getting married, moving houses, changing jobs, ending friendships and so on . How do you know whether you have stress? Could you give your answers to the following questions?
Doing relaxing exercises, talking with friends and listening to light music are all usual ways of relieving（减轻） stress. However, doctors now say that there are easier ways—people should laugh and smile more often. When you laugh and smile, your body relaxes. They also say that people, especially men, should cry more often, because crying is the natural way of relieving stress. 小题1:Who has got stress in everyday life? A. Men and women. B. Young people. C. Both A and B. 小题2: If you have over problems listed in the table, you are the person with stress. A. two B. three C. eight 小题3:Which of the followings is NOT the reason of stress? A.Taking exams. B. Taking sleeping pills. C. Making money. 小题4:What’s the easier way to relax your body? A. Talking with friends. B Doing relaxing exercises. C. Laughing, smiling and crying. 小题5:The main idea of the passage is . A.about stress and how to relieve your stress B. that there are many reasons for having stress C.that laughing and smiling more can help relieve your stress |