問題詳情

【題組】19.Most of the helium in the universe was formed
(A)in interstellar space
(B)in a very short time
(C)during the first minute of the universe's existence
(D)before most of the hydrogen

參考答案

答案：B
難度：適中0.5
統計：A(0),B(3),C(1),D(2),E(0)