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.
寫作批改
VIP與詳解卡管理
私人筆記( 0 )
