The ocean bottom even today is largely unexplored; until about a century ago, the deep-ocean floor was completely______, hidden

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问题 The ocean bottom even today is largely unexplored; until about a century ago, the deep-ocean floor was completely______, hidden beneath waters averaging over 3, 600 meters deep.

选项 A、inevitable
B、indefinite
C、incomparable
D、inaccessible

答案D

解析 本题考查形容词的语义。A不可避免的;B不确定的;C不能比拟的;D触及不到的。该句的大意为:即便时至今日,海洋底部仍然有大部分区域未被探索;大概在一个世纪以前,人们无法到达深藏于海面下方的、平均深度在3 600米以下的海底世界。
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