阿摩線上測驗
41 The emergency responders checked their breathing________ before entering the smoke-filled building.
(A) hierarchy
(B) compartment
(C) shutter
(D) apparatus
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統計： A(3), B(1), C(4), D(8), E(0) #3462365
統計： A(3), B(1), C(4), D(8), E(0) #3462365
