阿摩線上測驗
33. What is the primary source of light in the depths of the Mariana Trench?
(A) Artificial lighting from submarines
(B) Sunlight
(C) Bioluminescent creatures
(D) Underwater volcanoes
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統計： A(0), B(1), C(3), D(0), E(0) #3442651
統計： A(0), B(1), C(3), D(0), E(0) #3442651
