問題詳情

【題組】17.The creation of helium within stars
(A)cannot be measured
(B)produces energy
(C)produces hydrogen as a by-product
(D)causes helium to be much more abundant In old stars than In young star:

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)