C
Please Laugh
Some people say laughter(笑,笑声) is the best medicine. Scientists are going to believe this. They studied laughter carefully and found it's really good for us.
So what happens when we laugh? We exercise fifteen muscles(肌肉) in our face. Laughing is also good for every organ(器官) in our body. When we laugh, we breathe quickly and exercise the face, shoulders and chest. Our blood pressure(血压) goes down and our circulation(血液循环) gets better. Our heartbeat(心跳) is lower and our mind keeps even better.
Every minute we laugh is the same as forty-five minutes of relaxing. Many doctors all over the world believe laughter helps us get better when we are sick. Of course, there are many kinds of laughter. We may change the way we laugh in different ways. But we all have a laugh that is special to us. How do you usually laugh?
根据材料内容选择最佳答案。
()11. Laughter is good for our health because ____.
A. scientists think so
B. everybody thinks so
C. study has proved(证明) so
D. doctors say so
()12. When we laugh, we exercise ____.
A. fifteen muscles of the face
B. fifteen muscles of the chest
C. every organ of our body
D. fifteen organs of the body
()13. Laughter can make our ____ even better.
A. hearts
B. mind
C. chests
D. blood pressure
()14. One minute's laugh is the same as forty-five minutes' ____.
A. exercise
B. relaxing
C. thinking
D. use of the medicine
()15. From the passage, we know ____.
A. people laugh in the same way
B. one should learn different ways of laughing
C. we need to laugh forty-five minutes every day
D. everyone has his own way of laughing

11.C 12.A 13.B 14.B 15.D