試卷：無年度 - 97年1月TOFEL閱讀 (Page 161-163)#20921
| 科目：TOEFL(Test of English as a Foreign Language)托福
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試卷名稱：無年度 - 97年1月TOFEL閱讀 (Page 161-163)#20921
科目：TOEFL(Test of English as a Foreign Language)托福
13. According to the passage, scientists do not fully understand why double radio sources
(A) have not eventually disappeared
(B) cannot be observed with a telescope
(C) are beginning to slow down
(D) are not as big as some planets and stars
阿摩線上測驗
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