III. Reading Comprehension 
(A) Deep in the dark recesses of a limestone cave in Alabama soar life-sized figures thatspan earthly and spiritual realms. Traced into the mud of the cave ceiling by torchlightmore than a thousand years ago, the sprawling scene is so enormous and faint it cannotbe discerned by the naked eye—yet the ancient etchings are being celebrated as one ofthe largest rock-art creations in all of North America, and the largest to ever bediscovered in a cave. In a study published today in the journal Antiquity, researchers describe how they used aprocess known as 3D photogrammetry, originally developed to capture vast expanses ofEarth via aerial photos, to uncover the enigmatic images sheltered in an undergroundsystem in the Southeast United States known prosaically as “19th Unnamed Cave.” Itslocation is shielded to prevent looters and casual cavers who could damage or destroythe ancient artwork for profit or by mistake. Jan Simek, an archaeologist at the University of Tennessee, Knoxville and the paper’sfirst author, had been inside 19th Unnamed Cave before. In the first study of the karstcave in 1998, Simek and his co-author on the current paper, Alan Cressler, described itsglyph-covered ceilings as “the southernmost manifestation of what we now recognize asa widespread prehistoric artistic tradition” across North America before the arrival ofEuropean colonizers. Now, with the help of a 3D model, they’ve discovered even more art in 19th UnnamedCave—this time, images that are all but invisible to the naked eye, in a place neverthought to be home to life-sized rock art. Over 5,000 square feet in size, the cavechamber height is so low that modern cavers must squat—or lie down—to see it. Itsancient creators must have once done the same. “There are thousands and thousands of engravings” on the cave ceiling, says photographerand co-author Stephen Alvarez. And if that’s the case in one Alabama cave, the researchers say, it could be true in manymore. 'Those who had been there before' Traced in the mud ceiling of the cave by intrepid artists and preserved for a millenniumbefore being discovered, the massive etchings were created—and discovered—in anunforgiving setting.[unfinished]
【題組】76. What most suitable title would this passage be？
(A) Innovative Use of 3D Scans
(B) Archaeologists’ Use of 3D Scans
(C) Discovery of the 19th Unnamed Cave
(D) 3D Scans Reveal Significant Cave Art