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四、书面表达One possible version:Dear Peter,It's wonderful that you have won first prize in theChineseChess Network ChallengeCompetition as aforeigner.I could hardly wait to express my ssincerecongratulations to you.In the past few years,you have spent your abundanttime improving your skills.It is your devotion,diligenceand determination that lead to your success.You set a goodexample for me and push me to move forward.As a chesslover,I want to invite you to teach me chess skills in orderto renew my level.Please let me know when you are available.Bestwishes to you.Yours,Li Hua

17.B【解析】“突破与现实不相符的陈规旧说”“勇于面对实践中遇到的新问题”是推动科技创新的措施，①④入选。推动科技创新需要对原有科学技术进行辩证否定，②错误。实践基础上的理论创新是社会发展和变革的先导，③错误。