阿摩線上測驗
28 Before entering a burning building, firefighters must check their oxygen _____ to ensure they have enough air supply.
(A) distinguisher
(B) cylinder
(C) extinguisher
(D) cleaner
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統計： A(14), B(48), C(38), D(20), E(0) #3461797
統計： A(14), B(48), C(38), D(20), E(0) #3461797
