阿摩線上測驗
18. The smoke from wildfires can become a major ________ that leads to air quality deterioration.
(A) premise
(B) hazard
(C) hoax
(D) scam
答案：登入後查看
統計： A(44), B(513), C(70), D(31), E(0) #2673780
統計： A(44), B(513), C(70), D(31), E(0) #2673780
