A. It is completely frozen.
B. It is a saltwater lake.
C. It is beneath a thick slab of ice.
D. It is heated by the sun.
C
Dẫn chứng: A rather surprising geographical feature of Antarctica is that a huge freshwater lake, one of the world's largest and deepest, lies hidden there under four kilometers of ice. Now known as Lake Vostok, this huge body of water is located under the ice block that comprises Antarctica.
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