2. 外语
  3. People have (11) flying saucers for over a (12) years now and scientists have reported other things in space too. Many scien

People have (11) flying saucers for over a (12) years now and scientists have reported other things in space too. Many scien

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问题 People have  (11)  flying saucers for over a  (12)  years now and scientists have reported other things in space too. Many scientists have tried to  (13)  flying saucers but most have  (14)  . They have been called many names because no one is  (15)  what they are.
  
People have seen flying saucers for over a thousand years now and scientists have reported other things in space too. Many scientists have tried to photograph flying saucers but most have failed. They have been called many names because no one is sure what they are.
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答案sure
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