What does the passage mainly discuss? Which of the following is mentioned as supporting the Pleistocene overkill hypothesis?

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问题  What does the passage mainly discuss?
  Which of the following is mentioned as supporting the Pleistocene overkill hypothesis?

选项 A、Many of the animals that became extinct were quite large.
B、Humans migrated into certain regions around the time that major extinctions occurred.
C、There is evidence that new species were arriving in areas inhabited by humans.
D、Humans began to keep and care for certain animals.

答案B

解析
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