阅读理解。 Many people say that laughter is the best medicine. Scientists begin to agree with this. They are studying laughter seriously and finding it is really good. One minute of laughter is the same as forty-five minutes of relaxation(放松). Many doctors around the world believe that 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 situations (情形). But we all have a laugh that is special to us. How do you usually laugh? 1. What do many people think of laughter? [     ] A. They think it's bad for our health. B. They think it's the best medicine. C. They don't think it's good for our health. D. They think it's not the best medicine. 2. Laughter is good because ______. [     ] A. scientists think so B. everybody says so C. study has shown so D. everyone is happy 3. One minute of laughter equals (等于) forty-five minutes of _____. [     ] A. rest B. exercise C. thinking D. playing 4. Many doctors believe that laughter can help us when we are ill. [     ] A. feel worse B. get better C. get sad D. get surprised 5. According to (根据) the passage, ______. [     ] A. people laugh in the same way B. we need to laugh forty-five minutes every day C. everyone has his own way of laughing D. people laugh all the time