20. What does the passage mainly discuss?
(A) The effects of human activities on prehistoric wildlife
(B) The origins of the hunter-gatherer way of life
(C) The diets of large animals of the Pleistocene epoch
(D) The change in climate at the end of the Pleistocene epoch

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統計： A(5), B(3), C(0), D(0), E(0) #802143