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8. According to the passage, if the researchers had NOT found that two extinct carnivore species were free of tooth breakage, the researchers would have concluded that (A) the difference in breakage frequencies could have been the result of damage to the fossil remains in the La Brea pits (B) the fossils in other Pleistocene sites could have higher breakage frequencies than do the fossils in the La Brea pits (C) Pleistocene carnivore species probably behaved very similarly to one another with respect to consumption of carcasses (D) all Pleistocene carnivore species differed behaviorally from present-day carnivore species (E) predator densities during the Pleistocene era were extremely high
题目是什么个意思,怎么做啊 |
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