試卷：無年度 - 98年8月托福閱讀試題#20931
| 科目：TOEFL(Test of English as a Foreign Language)托福
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試卷名稱：無年度 - 98年8月托福閱讀試題#20931
科目：TOEFL(Test of English as a Foreign Language)托福
6. The author mentions magnesium in line 14 as an example of a substance that
(A) seemed to have phlogiston with a negative weight
(B) leaves no residue after burning
(C) was thought to be made of nearly pure phlogiston
(D)was thought to contain no phlogiston
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