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

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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

17. The creation of helium within stars
(A) cannot be measured
(B) produces energy
(C) produces hydrogen as a by-product
(D) causes helium to be much more abundant In old stars than In young star:

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