問題詳情

21 Acid rain causes the ground to release _________ substances; plants and trees are thus slowly poisoned.
(A) barren
(B) gross
(C) toxic
(D) weary

參考答案

答案:C
難度:簡單0.730061
統計:A(19),B(23),C(238),D(15),E(0)

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