49. In most cases, where does the explosion start in the building during its destruction?
(A) The topmost layer.
(B) The upper floors.
(C) The lower levels.
(D) The basement.
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統計: A(0), B(7), C(18), D(4), E(0) #2737445
統計: A(0), B(7), C(18), D(4), E(0) #2737445