阅读理解 Some small children don't know it's not polite to laugh at others. Some of them laugh at a lame (瘸的) or blind (盲) person,  or someone in bad clothes, but as they grow up, they learn not to hurt people's feelings by laughing at their problems. They learn to laugh at other things. Most important, they learn to laugh at themselves. For example, you make a mistake and lose a basketball match. Do you become angry? Or can you laugh at yourself and hope to do better next time? If you can, you've really grown up. 1. To laugh at others is not_______. A. easy B. polite C. difficult D. bad 2. When small children grow up, they learn_______. A. to hurt people's feelings B. not to hurt people's feelings C. to laugh at blind persons D. not to laugh at themselves 3. If you don't win a basketball match, you should_______. A. become angry with the winners B. laugh at the winners C. hope to do better next time D. lose another next time 4. We know from the passage, 'not to hurt people's feeling' means_______. A. small children have really grown up B. not do anything better next time C. often become angry with themselves D. still laugh at other's problems 5. The most important thing for children is to learn not to_______. A. laugh at the problems B. laugh at others C. win basketball matches D. get angry with their parents