问题 
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              The theory that the impact of a giant meteorite caused the extinction of the dinosaurs is 
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              The professor mentions a theory that people migrating from the Sahara were important to th 
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              By stating that the theories are "mutually exclusive" the author means thatREAD THE PASSAG 
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              Life, like science and art, is a theory about the world: a theory that in our case takes b 
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              theory holds the opinion that a linguistic sign derives its meaning from that which re 
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              I______that most people who wanted to buy our newspaper were either moving or getting marr 
 
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冀公网安备 13070302000102号