問題詳情
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
(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
參考答案
答案：A
難度：適中0.5
統計：A(1),B(1),C(0),D(0),E(0)
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