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
15. Why does the author mention "cosmic rays't' in line 7?
(A)As part of a list of things containing helium
(B) As an example of an unsolved astronomical puzzle
(C) To explain how the universe began
(D) To explain the abundance of hydrogen in the universe
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