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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統計： A(7), B(6), C(34), D(32), E(0) #3039493

詳解 (共 1 筆)

#5691865
"Very inhospitable to the vast majority of ocean life, the Mariana Trench remains vastly unexplored and has only been surveyed through the use of unmanned probes. Once thought to be a barren area of the ocean with nothing more than oceanic bacteria, the trench seemed to be the perfect submarine channel."
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