《四年级英语上册 Unit 1 Let's Go !lessson3 Bicycle课件 冀教版（三起）》由会员分享，可在线阅读，更多相关《四年级英语上册 Unit 1 Let's Go !lessson3 Bicycle课件 冀教版（三起）（14页珍藏版）》请在金锄头文库上搜索。
1、BICYCLEBICYCLE IS A TWO WHEELS OF LAND TRANSPORTATION, WHICH IS COMMONLY KNOWN AS A FREE CAR, OR BIKE. SINCE IT WAS INVENTED IN THE 18TH CENTURY , IT HAS BEEN POPULAR AMONG HUMAN BEINGS.DefinitionHISTORY IN 179018th century, the French Schiff Mubarak invented the earliest bike. The first bike is a w
2、ooden car, its relatively simple structure, neither drive nor steering, rider feet firmly placed against the front line, can only get off when you change the direction of moving car. Even so, when the Schiff Mubarak rode bike to the park, the presence of people were quite surprised and impressedHIST
3、ORY IN1817German Delaisse began making wooden-wheeled, almost like with Schiff Mubarak. However, in the control of the direction of the front wheels plus a handlebar, can change the way forward, but the rider still use two feet, stepping on the ground, in order to push the car rolled forward. So Ger
4、man baron(男爵）男爵）Calderon Morales became generally recognized bicycle inventor.HISTORY IN1861France Michaud and his son. Mounted on the front wheel can turn the pedal board(脚踏板）脚踏板）, the car in front of the saddle（鞍（鞍) rack above. They put the car as a “bicycle” of James（雅名）（雅名）, and exhibited at the
5、 Paris Exposition（世博会）（世博会） in 1867, the audience an eye-opener, once off the bike hot. However, due to the relationship between the off and on highly dangerous downhill easy to fall and potentially（潜在（潜在的）的） dangerous to the saddle again fixed to the frame（框架）（框架）.HISTORY IN1888Irish veterinary（兽医）
6、（兽医） Dunlop, derived from（源于）（源于） the treatment of cattle flatulence expansion（牛胃气膨胀）（牛胃气膨胀） in revelation（启示）（启示）, will own garden for watering rubber tube into a round stick and hit enough air mounted on the bike, this is the beginning of a pneumatic tire（充气轮胎）（充气轮胎）.HISTORY AFTER1925World bicycle
7、 production reached 200 million, of which the UK accounted for 50%, became a major exporter. Followed been widely developed bike, but also have to improve and enhance （提高）（提高）the structure. After World War II, the rapid development of automobile industry, bicycle production affected.THE EARLIEST BICYCLESTEERABLE(可操纵的可操纵的) BICYCLEHISTORY BIKEHISTORY TODAYWith the birth of the bike exercise bike also rise.In 1896 bike race is listed as an Olympic sportHISTORY TODAYlToday there are many famous bicycle brand such as Specialized,TIME,BMC.lSome Chinese famous brand such as MeiLiDa（美利达）TODAYS BIKES
