29. What can be inferred from paragraph 1?
(A) The Mariana Trench was once used for US submarine warfare.
(B) The U.S. was the first country to send a ship and record the depth of the
Mariana Trench.
(C) The depth of the Mariana Trench is volatile.
(D) It never occurred to the navy personnel that such complex life forms existed at
that depth.
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