問題詳情

13.According to the passage, helium is
(A) the second-most abundant element in the universe
(B) difficult to detect
(C) the oldest element in the universe
(D) the most prevalent element in quasars

參考答案

答案:A
難度:非常困難0
統計:A(0),B(0),C(4),D(2),E(0)

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