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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 realm is another vast area about which our knowledge is _____.
- A.erroneous
- B.confusing
- C.frustrating
- D.rudimentary
- E. delusive
- F.sketchy
D,F显示答案
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以上解析由 考满分老师提供。
