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

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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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