单元整体教案NSEFCII-U2017(The first period)
[05-11 15:22:15] 来源：http://www.77xue.com 高二英语教案 阅读：8170次
概要： village to village was on foot. When men learned to use the horse, communication became much quicker. However, compared to the modern world communication was still quite slow. Many parts of the world had no knowledge of events in other places. Later, the post was introduced and horse riders carried letters. This meant that communication was further improved. Horses drawn coac
单元整体教案NSEFCII-U2017(The first period),标签：人教版高二英语教案,高二英语教案下载,http://www.77xue.com
village to village was on foot. When men learned to use the horse,
communication became much quicker. However, compared to the modern
world communication was still quite slow. Many parts of the world
had no knowledge of events in other places. Later, the post was
introduced and horse riders carried letters. This meant that
communication was further improved. Horses drawn coaches could move
people from town to town in quite a comfortable way. At the
beginning of the last century the steam train was invented and for
the first time really fast communication became possible. Not only
could letters be sent easily from one part of a country to another,
but travel was made easy, too. At about the same time, steam ships
helped communication between countries.
The invention of the telegraph in the middle of the last century
further increased the speed at which messages could be sent. In this
单元整体教案NSEFCII-U02(The first period)由www.77xue.com收集及整理,转载请说明出处www.77xue.com
www.77xue.com system electrical signals, in code, are sent along metal wires.
These signals travel so fast that they could go nearly eight times
round the world in one second. A special device is needed to send
the code. At the other end another device is used in order to
receive the code. By this method messages can be sent over distances
of several hundred kilometres. With the invention of the telephone
the human voice could be sent over long distances. Because of this
the telephone system replaced the telegraph for quick communication
over long distances. The telegraph is still used, however, by
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