摘要：2．短文的开头已给出. 提示词语: junk food好吃但不利于健康的食品snacks各种零食 A healthy diet and regular exercise may help to prevent obesityamong childern．Take Li Ming for example． Li Ming used to be a healthy boy.but 答案:A healthy diet and regular exercise may help to prevent obesity among children. Take Li Ming for example. Li Ming used to be a healthy boy. But over a year ago, he got into the habit of eating a lot of junk food and snacks. Besides, he spent a lot of time lying on the sofa, watching TV, and did little exercise. As a result, he put on so much weight that he found it difficult to climb the stairs. So Li Ming decided to change the unhealthy life style. He began to have a balanced, healthy diet. He also took part in various sports activities such as swimming, skating, running and playing basketball. Months later, Li Ming became as fit as before.

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