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1. Many        (  discover) have  changed  our life.

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阅读短文,从方框中选择适当的词并用其正确形式填空,使短文通顺、意思完整。 

according, compass, good, as, use, between, 

well, east, same, bowl, south, necessary

  The compass is very 1     for guiding ships and  planes. Hikers often need  a 2        ,too. A compass will always make it possible for you  to know where is the     north.    

  The compass is a special magnet (磁体). The  Chinese were the first people to use the magnet 3      a compass. They first used compasses to guide their ships 4      the years 100 BC and AD 100. Their compasses were simple and not convenient.

  To make their compass,these early Chinese people placed the magnet needle (磁针)on soft wood and then put them in a 5      of water. The floating (不固定的) magnet turned easily,and made itself with the directions,north and 6     

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  Compasses worked 9      on wooden ships. But when metal ships appeared in the 1800s,the simple magnetic compass was not correct any more. Many kinds of new compasses begin to be 10      for sailing.

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