语气很重要,是在聊天而非背课文: Well, it's my turn~~ (正式语前缓解紧张用) Good morning/afternoon ladies and gentlemen, it's my pleasure to show you my homework! 如果想体现难度,插播一句:Pls be free to let me know if there's any doubt, I'll appreciate it! Now, let's begin with ... (比如第一页 the first page)...结束语:That's all!Thank you very much for your attention!Thank you everybody!