39. Why do farmers in Assam dig trenches in tea gardens?
(A) To protect tea trees.
(B) To trap elephants.
(C) To expand tea farms.
(D) To mark boundaries of tea gardens.
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統計: A(199), B(45), C(49), D(31), E(0) #3053810
統計: A(199), B(45), C(49), D(31), E(0) #3053810