What is Alvin? "... a world that is still full of mysteries" refers to

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问题 What is Alvin?
"... a world that is still full of mysteries" refers to

选项 A、the earth.
B、out space.
C、the ocean.
D、Mars.

答案C

解析本文讨论探索海底世界的潜水装置，所以“充满神秘色彩的世界”指的就是海洋。

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