39. It can be Inferred from the passage that alders are used in mountainous areas to
(A) prevent water from carrying away soil
(B) hold the snow
(C) protect mines
(D) provide material for housing
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統計: A(9), B(0), C(0), D(2), E(0) #803338
統計: A(9), B(0), C(0), D(2), E(0) #803338