假如你是一名导游，陪同某国际旅行社游览长城。车抵长城，下车前你准备对大家作必要的介绍和交代。请拟一份讲话稿。讲话稿必须包括以下几点：
简单介绍长城（是世界上最长的城墙，有2000多年的历史，是世界奇观之一）；
讲话的时间是8点半，在长城逗留两个半小时，11点钟离开：
游览车（bus） 在入口处等候，记住车号，准时返回：
贵重（valuable）物品随身携带，下车前关上车窗；
祝大家玩得愉快。Here we are at the foot of the Great Wall! It is the longest wall in the world and has a history of over 2000 years. It is one of the wonders in the world. We’ll spend two hours and a half here. It’s 8:30 now. we’ll leave here at 11:00. The bus will be waiting for us at the entrance. Please remember our bus number and be back on time. Besides, please take your valuable things with you and shut all the windows before you get off.
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(答案→)Here we are at the foot of the Great Wall! It is the longest wall in the world and has a history of over 2000 years. It is one of the wonders in the world. We’ll spend two hours and a half here. It’s 8:30 now. we’ll leave here at 11:00. The bus will be waiting for us at the entrance. Please remember our bus number and be back on time. Besides, please take your valuable things with you and shut all the windows before you get off.
解析：本文是一篇简单的讲话稿，因为比较口语化，所以要注意用词的选择，不要使用过于严肃的词汇。本文的关键是把要表达的内容表达正确，准确。时态以现在时和将来时为主。在写作时务必要注意不要遗漏要点，因为这些都是必须要注意的关键点。