問題詳情
10. It is difficult to breathe on a mountain because there is____________oxygen in the air.
(A) incurable
(B) insufficient
(C) insignificant
(D) inseparable
參考答案
答案：B
難度：簡單0.767
書單：沒有書單，新增
用户評論
【odelia】評論
It is difficult to breathe on a mountain because there is____________ oxygen in the air.在山上很難呼吸，因為空氣中有____________氧氣。