Space is often referred to as the final frontier, as the only rea

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Space is often referred to as the final frontier, as the only realm of which humankind has still to gain substantial understanding, yet the ocean is also another vast area about which our knowledge is _____.

A、erroneous
B、confusing
C、frustrating
D、rudimentary
E、delusive
F、sketchy

答案：D,F

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