試題詳解

45.“Good” fires are ecologically crucial, clearing out dead bush and returning nutrients to the soil.
(A)Ecologically speaking, fires can never be good considering their destructive power.
(B)Fires are important to the environment in the way they help keep good substances from going into the ground.
(C)Some fires are good and ecologically essential because they turn the scorched dry trees into nourishment in the earth.
(D)It is considered positive to extinguish fires that burn down useless trees and reserve nutrients for valuable ones.