Unit4 Inventions 复习课件(共11张PPT).pptx
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1、InventionsInventions Which invention do you think is the greatest one?Why?Reading P50 Reading P50 I think its.Becausechange the _help people live a _The wheelSignificance:_ became faster and more comfortableUse:a few thousand years ago:on carriages in the early 19th century:on _ at the start of the
2、20th century:on _The telephoneInventor:_(in 1876)Significance:people can speak to each other over _people can keep in touch with each other anytime,_Great inventionsThe light bulbInventor:Thomas Edison(in _)Before the invention:people used _,gas lamps,_Significance:people can do many things in the e
3、venings as they can _worldbetter lifetravellingtrainscarsAlexander Graham Belllong distancesmobile phones:anywhere1879oil lampscandlesin the daytimeComplete the graphic organizer and then retell the Complete the graphic organizer and then retell the text according to it.text according to it.The _ is
4、 probably the greatest invention in history.Without the wheel,we would not have the _,trains and _.One of the first practical telephones was _ in 1876.People could _ to each other _ long distances.Today we use _ phones to _ _ _ _ each other anytime,anywhere.Before the _ of the light _,people had to
5、use oil lamps,_ lamps or _ to see at night.Now,people can do _ _ things in the evenings _ _ _ in the daytime.wheelcarriagescarsinventedspeakovermobilekeep in touch withinventionbulbgascandles as manyas they canFill in the blanks to finish the summary of the text.Do you know why the ballpoint pen was
6、 invented?People used the fountain pen(钢笔钢笔)to write before the ballpoint pen was invented.have to refill it all the timemake a messcant dry easilyRead the article to learn more Read the article to learn more about the ballpoint pen.about the ballpoint pen.1.Why did Br decide to invent the ballpoint
7、 pen?2.How did Brs brother help him invent the ballpoint pen?3.How does the ballpoint pen work?4.How do people remember Br for his invention today?Because he had to refill his fountain pen all the time,and the ink did not dry easily and it sometimes made a mess on the paper.Brs brother helped him de
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