人教版九年級英語上冊《When was it invented?》SectionA PPT下載(第1課時)，共34頁。
情景導入
T：There are many useful things in the world.They help us a lot in life.(Show some pictures on the screen)When were they invented?
S1：The telephone was invented in 1876.
S2：The computer was invented in…
生成新知
Do you know them?
When were they invented?
Who were they invented by?
Talk about the inventions(發明).
Which one do you think is the most helpful in our daily life?
問題探究
辨析invent/discover/find/find out
① invent意為“發明；創造”，主要指通過想象、研究、勞動等創造出前所未有的東西，尤指科技上的創造發明。
② discover指發現或偶然發現本身就存在但未被認識的事物。
③ find強調找的結果，即“找到”，通常指偶然發現。
④ find out指經過觀察、調查，把某事物查出來，意為“搞清楚；弄明白”。
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關鍵詞：When was it invented? PPT課件免費下載，.PPT格式；
