41. According to the passage, which of the following factors caused Appalachian highlanders to leave their homes?
(A) destruction of the forests
(B) family disputes
(C) overcrowding
(D) soil erosion

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統計： A(3), B(7), C(95), D(5), E(0) #3246126

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 As the Appalachians filled up, many highlanders began looking elsewhere for similar areas to pioneer.
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