問題詳情

【題組】3. Bacteria are not all bad. Quite a few species of them are _______ to our health.
(A) beneficial
(B) social
(C) special
(D) usual

參考答案

答案：A[無官方正解]
難度：簡單0.857143
統計：A(12),B(2),C(0),D(0),E(0)