39. The flight made an emergency landing after experiencing severe ______ that injured dozens of passengers.
(A) hydration
(B) turbulence
(C) magnitude
(D) deprecation
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統計: A(4), B(13), C(2), D(0), E(0) #4003046
統計: A(4), B(13), C(2), D(0), E(0) #4003046