用方框中所给单词的适当形式填空 ,使短文正确,通顺,每词限一次（well ,find ,star ,invent ,our any ,have ,one ,direction ,see）Where are we That was a big question when we （）explored our world long ago .The early explorers

用方框中所给单词的适当形式填空 ,使短文正确,通顺,每词限一次（well ,find ,star ,invent ,our any ,have ,one ,direction ,see）Where are we That was a big question when we （）explored our world long ago .The early explorers
用方框中所给单词的适当形式填空 ,使短文正确,通顺,每词限一次
（well ,find ,star ,invent ,our any ,have ,one ,direction ,see）
Where are we That was a big question when we （）explored our world long ago .The early explorers found that the （）in the sky were good landmarks .Using the stars ,they could（）out where they were and in which （）they were going .This method worked well at night as long sd the weather was good and the stars could be （）.But it did not work so （）during the rest of the time .That was a problem .
Today ,the problem （）been solved by the Global Positioning System .Or GPS .It is like a man-made star .We can use it at （）time ,in any place and in any weather to find out （）position .It can also be used to study the shape of the earth .GPS is a great （）that helps us explore our planet and discover we are .

用方框中所给单词的适当形式填空 ,使短文正确,通顺,每词限一次（well ,find ,star ,invent ,our any ,have ,one ,direction ,see）Where are we That was a big question when we （）explored our world long ago .The early explorers


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