[单选题] 提问人:匿名网友 提问时间:2021-08-22

According to the author, when will the problems to explore the deeper sea largely be solved?


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.

提问人:匿名网友 提问时间:2021-08-22

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