Until about a century ago, the deep ocean floor was completely inaccessible, hid

游客2025-01-28 18

问题 Until about a century ago, the deep ocean floor was completely inaccessible, hidden beneath waters averaging 3,600 meters deep.

选项 A、understandable
B、recognizable
C、unreachable
D、unusable

答案 C

解析 inaccessible(达不到的，难接近的)；unreachable(不可及的)；understandable(可理解的)；recognizable(可认出的)；unusable(不能用的)。

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