64. The unexpected ______ in tourism revenue boosted the regional economy, though local infrastructure struggled to accommodate the influx of visitors. (A)plunge (B)decline (C)surge (D)lull

72. Only through the meticulous application of advanced neuroimaging ______ the true extent of the brain's capacity for neuroplasticity, a phenomenon long considered impossible. (A)have researchers been able to fathom (B)do researchers have finally grasped (C)did researchers begin to hypothesize (D)had researchers been capable of elucidating

64. The unexpected ______ in tourism revenue boosted the regional economy, though local infrastructure struggled to accommodate the influx of visitors.
(A)plunge
(B)decline
(C)surge
(D)lull

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