問題詳情

【題組】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)