試卷：無年度 - 99年1月托福閱讀#20939
| 科目：TOEFL(Test of English as a Foreign Language)托福
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試卷名稱：無年度 - 99年1月托福閱讀#20939
科目：TOEFL(Test of English as a Foreign Language)托福
13. In the first paragraph, the author mentions that
(A) the Earth began as a molten mass
(B) a thin layer of magma flows beneath the Earth's crust
(C) the minerals found in igneous rock are very common
(D) igneous rock is continually being formed
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