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What is one of the main reasons NASA's exoplanet program could take decades to find definitive signs of life? 
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In the sentence “Or someone” (l. 23), the use of “Or” expresses the emphasis on  
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What did the alien’s skin look like?
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In the sentence “Most of them were occupied…” (?. 6), the word in bold refers to  
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It’s correct to say that