假定你是李华，准备参加学校举办的主题为“健康成长”的英语作文比赛。请按要求写一篇短文，主要内容包括：
乐观的人生态度；
努力学习；
参加体育锻炼。
生词：态度恶劣attitude
注意：1.词数100左右；2.可以适当增加细节，以使行文连贯；
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