6. Because unvented gas fireplaces exhaust directly into the room rather than outside, they also emit pollutants which may _____ some health risks.
(A) run
(B)vent
(C) entail
(D) include
詳解 (共 2 筆)
未解鎖
Because unvented gas...
未解鎖
(B)ventn.[C]出口;出路;漏孔...