We can use satellite to help us m　　 telephone calls to foreign countries．

A young tree must be tied to a stick to keep it s　　．

The river is 20 kilometers long，80 metres wide and two metres d　　．

The trees can stop the wind from b　　　　 the earth away．

Forests help to keep water from running away，so d　　　　 doesn't often happen．

听力题

1)听对话，填出王叔叔去各地的时间及两地之间的距离(10分)

2)听短文，补全所缺的词(10分)

　　Man-made satellites have been 　　1　　 up into space by many 　　2　　 ．These satellites go 　　3　　 the earth and help us to 　　4　　 more about the earth，the 　　5　　 and other things．Most countries 　　6　　 these satellites to send and receive 　　7　　 ．For example，with their help China can send its TV and radio programmes to the other side of the 　　8　　 ．Foreign countries can send their programmes to China．We can 　　9　　 use satellites to help us make telephone 　　10　　 to foreign countries．

I think the most u　　invention in the world is a computer．

The radio is too noisy．Please t　　it down．

Do you know how to s　　messages by telegraph?

Edison was a great American i　　 ．He invented many things in his life．