試卷：無年度 - 95年8月TOFEL閱讀(Page19)#20915
| 科目：TOEFL(Test of English as a Foreign Language)托福
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試卷名稱：無年度 - 95年8月TOFEL閱讀(Page19)#20915
科目：TOEFL(Test of English as a Foreign Language)托福
1. The author refers to the ocean bottom as a "frontier" in line 2 because it
(A) is not a popular area for scientific research
(B) contains a wide variety of life forms
(C) attracts courageous explorers
(D) is an unknown territory
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