What is the best title for the passage? [br] According to the author, when will

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问题 What is the best title for the passage? [br] According to the author, when will the problems to explore the deeper sea largely be solved?

选项 A、In the next generation.
B、By the end of the 20th century.
C、In the near future.
D、By the middle of the 21st century.

答案 D

解析 21世纪50年代，也就是2050年左右。

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