原题
Blue holes, such as the Far Side Blue Hole in the Abaco Islands, are large seawater sinkholes that tend to have varying water density and irregularities in their steep walls. In 2021, researchers studied the previously unexplored Taam Ja' Blue Hole (TJBH) in Chetumal Bay, Mexico; using echo sounder mapping, they determined its maximum depth to be about 274 meters. In the complex environments of blue holes, however, echo sounder mapping has limitations. So, in 2023, Joan A. Sánchez-Sánchez and colleagues employed a conductivity, temperature, and depth (CTD) profiler to remeasure the depth of the TJBH. The profiler recorded depths around 420 meters but was unable to confirm detection of the bottom of the hole, suggesting that ______
Which choice most logically completes the text?
Aalthough both echo sounder mapping and the CTD profiler have known limitations, they produce reliable estimations of the depth of blue holes when used together.
Bwhile the CTD profiler may be better suited than echo sounder mapping for measuring the depth of blue holes, another measurement approach is likely needed to ascertain the maximum depth of the TJBH.
Calthough the maximum depth of the TJBH has yet to be conclusively detected, the bottom of the hole is most likely between 274 and 420 meters below sea level.
Dwhile the CTD profiler can discern the properties of underwater terrains more comprehensively than echo sounder mapping can, echo sounder mapping produces more accurate measurements at greater underwater depths.
正确答案：B
解题思路
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