37. Why is a surplus of food important?
(A) People could leave the hunter-gatherer life style.
(B) It gives opportunities for trade.
(C) People don’t have to move from place to place.
(D) Weather is not very important.
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統計: A(6), B(41), C(7), D(2), E(0) #1219787
統計: A(6), B(41), C(7), D(2), E(0) #1219787