試題詳解

試卷：無年度 - 98年5月托福閱讀試題#20930 | 科目：TOEFL(Test of English as a Foreign Language)托福

試卷資訊

試卷名稱：無年度 - 98年5月托福閱讀試題#20930

科目：TOEFL(Test of English as a Foreign Language)托福

12. what does the passage mainly explain?
(A)How stars produce energy
(B)The difference between helium and hydrogen
(C)When most of the helium in the universe was formed
(D)Why hydrogen is abundant

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