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