人教a版必修5_21数列的概念与简单表示法(二)

人教a版必修5_21数列的概念与简单表示法(二)内容摘要：

nkled lots of salt on them so they were__________. The history of chips Did you know were invented 1853 were crispy really salty Make up a short dialogue about the history of potato chips with your partner. 和你的同伴一起编排一段有关薯片历史的对话 Go through the long passage and try to find the main ideas about the passage, Then write a passage about it for short. 快速阅读该长篇文章，设法找出文章中的大意，并进行缩写。 1. Wood can be used for______ paper. A. making B. to make C. made D. make 2． Do you think the light bulbs were invented _____? –No, I don’t thing so. A. by mistakes B. by mistake C. for mistake D. with mistakes A B 1. 电拖鞋是什么时候发明的。 When _____ the electric ________ invented? 2. 它们是由谁发明的。 ______ were they invented ______? 3. 妈妈加了盐，但它仍然不够咸。 Mom added salt but it still wasn’t _____ _______. were slippers Who by salty enough • １ The alarm clock is one of the most annoying ________ （发明） . • 2 The scoops_______ (use) for having soup. • = The scoops___ ___(use) ____ have soup. • 3The alarm clock is used for___ ___ ___ • （叫醒我） • ４ The potato chips were invented by a chef. • ___ ___the potato chips ________by? • By ____ _____the potato chips ______ ? • 5The telephone was invented in 1876. • ___ ___the telephone ____ ? 达标练习 inventions are used are used to waking me up Who were invented whom were invented When was invented use the ________to count. The calculator____________ calculator is used for counting. The microwave oven______。